20995118880 has 96 divisors (see below), whose sum is σ = 66170913984. Its totient is φ = 5595626496.

The previous prime is 20995118857. The next prime is 20995118887. The reversal of 20995118880 is 8881159902.

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

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20995118887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 942754 + ... + 964766.

It is an arithmetic number, because the mean of its divisors is an integer number (689280354).

Almost surely, 2^20995118880 is an apocalyptic number.

20995118880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20995118880 is an abundant number, since it is smaller than the sum of its proper divisors (45175795104).

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

20995118880 is a wasteful number, since it uses less digits than its factorization.

20995118880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24018 (or 24010 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 51.

The spelling of 20995118880 in words is "twenty billion, nine hundred ninety-five million, one hundred eighteen thousand, eight hundred eighty".