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231012020 = 22511550601
BaseRepresentation
bin11011100010011…
…11011010110100
3121002200121220202
431301033122310
5433114341040
634531220032
75503366301
oct1561173264
9532617822
10231012020
11109444828
1265447618
1338b24b05
14229760a8
1515433015
hexdc4f6b4

231012020 has 12 divisors (see below), whose sum is σ = 485125284. Its totient is φ = 92404800.

The previous prime is 231012011. The next prime is 231012029. The reversal of 231012020 is 20210132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231012011) and next prime (231012029).

It can be written as a sum of positive squares in 2 ways, for example, as 102779044 + 128232976 = 10138^2 + 11324^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231011992 and 231012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231012029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775281 + ... + 5775320.

It is an arithmetic number, because the mean of its divisors is an integer number (40427107).

Almost surely, 2231012020 is an apocalyptic number.

231012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231012020 is an abundant number, since it is smaller than the sum of its proper divisors (254113264).

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

231012020 is a wasteful number, since it uses less digits than its factorization.

231012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11550610 (or 11550608 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 231012020 is about 15199.0795773955. The cubic root of 231012020 is about 613.5898862383.

Adding to 231012020 its reverse (20210132), we get a palindrome (251222152).

The spelling of 231012020 in words is "two hundred thirty-one million, twelve thousand, twenty".

Divisors: 1 2 4 5 10 20 11550601 23101202 46202404 57753005 115506010 231012020