20472879456 has 72 divisors (see below), whose sum is σ = 58245818904. Its totient is φ = 6821237760.

The previous prime is 20472879407. The next prime is 20472879473. The reversal of 20472879456 is 65497827402.

20472879456 is a `hidden beast` number, since 2 + 0 + 472 + 87 + 94 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 681391 + ... + 710801.

It is an arithmetic number, because the mean of its divisors is an integer number (808969707).

Almost surely, 2^20472879456 is an apocalyptic number.

It is an amenable number.

20472879456 is an abundant number, since it is smaller than the sum of its proper divisors (37772939448).

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

20472879456 is a wasteful number, since it uses less digits than its factorization.

20472879456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31844 (or 31833 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 20472879456 in words is "twenty billion, four hundred seventy-two million, eight hundred seventy-nine thousand, four hundred fifty-six".