20872552640 has 28 divisors (see below), whose sum is σ = 49702766736. Its totient is φ = 8349020928.

The previous prime is 20872552639. The next prime is 20872552651. The reversal of 20872552640 is 4625527802.

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, 32613044 + ... + 32613683.

It is an arithmetic number, because the mean of its divisors is an integer number (1775098812).

Almost surely, 2^20872552640 is an apocalyptic number.

20872552640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20872552640 is an abundant number, since it is smaller than the sum of its proper divisors (28830214096).

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

20872552640 is an equidigital number, since it uses as much as digits as its factorization.

20872552640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65226744 (or 65226734 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 41.

The spelling of 20872552640 in words is "twenty billion, eight hundred seventy-two million, five hundred fifty-two thousand, six hundred forty".