20904228880 has 80 divisors (see below), whose sum is σ = 48906405504. Its totient is φ = 8309550080.

The previous prime is 20904228871. The next prime is 20904228893. The reversal of 20904228880 is 8882240902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 10960887 + ... + 10962793.

Almost surely, 2^20904228880 is an apocalyptic number.

20904228880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20904228880 is an abundant number, since it is smaller than the sum of its proper divisors (28002176624).

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

20904228880 is a wasteful number, since it uses less digits than its factorization.

20904228880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704 (or 2698 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 20904228880 in words is "twenty billion, nine hundred four million, two hundred twenty-eight thousand, eight hundred eighty".