20418913956 has 24 divisors (see below), whose sum is σ = 54450437440. Its totient is φ = 5833975392.

The previous prime is 20418913937. The next prime is 20418913967. The reversal of 20418913956 is 65931981402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121541071 + ... + 121541238.

Almost surely, 2^20418913956 is an apocalyptic number.

It is an amenable number.

20418913956 is an abundant number, since it is smaller than the sum of its proper divisors (34031523484).

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

20418913956 is a wasteful number, since it uses less digits than its factorization.

20418913956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243082323 (or 243082321 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 20418913956 in words is "twenty billion, four hundred eighteen million, nine hundred thirteen thousand, nine hundred fifty-six".