20404361656 has 96 divisors (see below), whose sum is σ = 47176506000. Its totient is φ = 8220871680.

The previous prime is 20404361647. The next prime is 20404361671. The reversal of 20404361656 is 65616340402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10468170 + ... + 10470118.

Almost surely, 2^20404361656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20404361656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23588253000).

20404361656 is an abundant number, since it is smaller than the sum of its proper divisors (26772144344).

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

20404361656 is a wasteful number, since it uses less digits than its factorization.

20404361656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557 (or 3546 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20404361656 in words is "twenty billion, four hundred four million, three hundred sixty-one thousand, six hundred fifty-six".