20880690720 has 96 divisors (see below), whose sum is σ = 66209996160. Its totient is φ = 5531289600.

The previous prime is 20880690709. The next prime is 20880690763. The reversal of 20880690720 is 2709608802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71565 + ... + 216524.

It is an arithmetic number, because the mean of its divisors is an integer number (689687460).

Almost surely, 2^20880690720 is an apocalyptic number.

20880690720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20880690720 is an abundant number, since it is smaller than the sum of its proper divisors (45329305440).

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

20880690720 is a wasteful number, since it uses less digits than its factorization.

20880690720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288258 (or 288250 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 20880690720 in words is "twenty billion, eight hundred eighty million, six hundred ninety thousand, seven hundred twenty".