20856479272 has 16 divisors (see below), whose sum is σ = 39116469600. Its totient is φ = 10425420720.

The previous prime is 20856479263. The next prime is 20856479311. The reversal of 20856479272 is 27297465802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320754 + ... + 380257.

It is an arithmetic number, because the mean of its divisors is an integer number (2444779350).

Almost surely, 2^20856479272 is an apocalyptic number.

It is an amenable number.

20856479272 is a deficient number, since it is larger than the sum of its proper divisors (18259990328).

20856479272 is a wasteful number, since it uses less digits than its factorization.

20856479272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704736 (or 704732 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 20856479272 in words is "twenty billion, eight hundred fifty-six million, four hundred seventy-nine thousand, two hundred seventy-two".