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20511400 = 2352731323
BaseRepresentation
bin100111000111…
…1101010101000
31102121002100111
41032033222220
520222331100
62011344104
7336226000
oct116175250
942532314
1020511400
111063a578
126a52034
134332130
142a1d000
151c026ba
hex138faa8

20511400 has 192 divisors, whose sum is σ = 62496000. Its totient is φ = 6209280.

The previous prime is 20511353. The next prime is 20511437. The reversal of 20511400 is 411502.

It is a Harshad number since it is a multiple of its sum of digits (13).

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 47 ways as a sum of consecutive naturals, for example, 891789 + ... + 891811.

It is an arithmetic number, because the mean of its divisors is an integer number (325500).

Almost surely, 220511400 is an apocalyptic number.

20511400 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 20511400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248000).

20511400 is an abundant number, since it is smaller than the sum of its proper divisors (41984600).

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

20511400 is a wasteful number, since it uses less digits than its factorization.

20511400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20511400 is about 4528.9513134941. The cubic root of 20511400 is about 273.7359062266.

Adding to 20511400 its reverse (411502), we get a palindrome (20922902).

The spelling of 20511400 in words is "twenty million, five hundred eleven thousand, four hundred".