20400565104 has 60 divisors (see below), whose sum is σ = 57207865000. Its totient is φ = 6786536832.

The previous prime is 20400565099. The next prime is 20400565111. The reversal of 20400565104 is 40156500402.

20400565104 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 0 + 5 + 651 + 0 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70099 + ... + 213810.

Almost surely, 2^20400565104 is an apocalyptic number.

20400565104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20400565104 is an abundant number, since it is smaller than the sum of its proper divisors (36807299896).

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

20400565104 is a wasteful number, since it uses less digits than its factorization.

20400565104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284422 (or 284413 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 20400565104 in words is "twenty billion, four hundred million, five hundred sixty-five thousand, one hundred four".