20972749680 has 120 divisors (see below), whose sum is σ = 72151475760. Its totient is φ = 5456317440.

The previous prime is 20972749661. The next prime is 20972749717. The reversal of 20972749680 is 8694727902.

20972749680 is a `hidden beast` number, since 2 + 0 + 9 + 72 + 7 + 496 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325710 + ... + 384749.

It is an arithmetic number, because the mean of its divisors is an integer number (601262298).

Almost surely, 2^20972749680 is an apocalyptic number.

20972749680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20972749680 is an abundant number, since it is smaller than the sum of its proper divisors (51178726080).

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

20972749680 is a wasteful number, since it uses less digits than its factorization.

20972749680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710519 (or 710510 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 20972749680 in words is "twenty billion, nine hundred seventy-two million, seven hundred forty-nine thousand, six hundred eighty".