20551492972 has 12 divisors (see below), whose sum is σ = 36937143040. Its totient is φ = 9998023536.

The previous prime is 20551492957. The next prime is 20551492991. The reversal of 20551492972 is 27929415502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69430572 + ... + 69430867.

Almost surely, 2^20551492972 is an apocalyptic number.

It is an amenable number.

20551492972 is a deficient number, since it is larger than the sum of its proper divisors (16385650068).

20551492972 is a wasteful number, since it uses less digits than its factorization.

20551492972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138861480 (or 138861478 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 20551492972 in words is "twenty billion, five hundred fifty-one million, four hundred ninety-two thousand, nine hundred seventy-two".