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231020000 = 255411551
BaseRepresentation
bin11011100010100…
…01010111100000
3121002201000212022
431301101113200
5433120120000
634531321012
75503431461
oct1561212740
9532630768
10231020000
1110944a822
1265450168
1338b28633
1422978d68
1515435585
hexdc515e0

231020000 has 60 divisors (see below), whose sum is σ = 568393056. Its totient is φ = 92400000.

The previous prime is 231019991. The next prime is 231020047. The reversal of 231020000 is 20132.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 231020000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14225 + ... + 25775.

Almost surely, 2231020000 is an apocalyptic number.

231020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284196528).

231020000 is an abundant number, since it is smaller than the sum of its proper divisors (337373056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231020000 is an equidigital number, since it uses as much as digits as its factorization.

231020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11581 (or 11558 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 231020000 is about 15199.3420910249. The cubic root of 231020000 is about 613.5969513699.

Adding to 231020000 its reverse (20132), we get a palindrome (231040132).

The spelling of 231020000 in words is "two hundred thirty-one million, twenty thousand".

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 80 100 125 160 200 250 400 500 625 800 1000 1250 2000 2500 4000 5000 10000 11551 20000 23102 46204 57755 92408 115510 184816 231020 288775 369632 462040 577550 924080 1155100 1443875 1848160 2310200 2887750 4620400 5775500 7219375 9240800 11551000 14438750 23102000 28877500 46204000 57755000 115510000 231020000