20400403600 has 30 divisors (see below), whose sum is σ = 49011970610. Its totient is φ = 8160161280.

The previous prime is 20400403591. The next prime is 20400403601. The reversal of 20400403600 is 630400402.

It can be written as a sum of positive squares in 3 ways, for example, as 58798224 + 20341605376 = 7668^2 + 142624^2 .

It is not an unprimeable number, because it can be changed into a prime (20400403601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25500105 + ... + 25500904.

Almost surely, 2^20400403600 is an apocalyptic number.

20400403600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400403600 is an abundant number, since it is smaller than the sum of its proper divisors (28611567010).

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

20400403600 is a wasteful number, since it uses less digits than its factorization.

20400403600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51001027 (or 51001016 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The spelling of 20400403600 in words is "twenty billion, four hundred million, four hundred three thousand, six hundred".