20403956972 has 48 divisors (see below), whose sum is σ = 42600940032. Its totient is φ = 8360668800.

The previous prime is 20403956959. The next prime is 20403956999. The reversal of 20403956972 is 27965930402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1830488 + ... + 1841600.

It is an arithmetic number, because the mean of its divisors is an integer number (887519584).

Almost surely, 2^20403956972 is an apocalyptic number.

It is an amenable number.

20403956972 is an abundant number, since it is smaller than the sum of its proper divisors (22196983060).

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

20403956972 is a wasteful number, since it uses less digits than its factorization.

20403956972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13998 (or 13996 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 20403956972 in words is "twenty billion, four hundred three million, nine hundred fifty-six thousand, nine hundred seventy-two".