20908569880 has 64 divisors (see below), whose sum is σ = 51345355680. Its totient is φ = 7599513600.

The previous prime is 20908569863. The next prime is 20908569917. The reversal of 20908569880 is 8896580902.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

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, 1027000 + ... + 1047160.

Almost surely, 2^20908569880 is an apocalyptic number.

20908569880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20908569880 is an abundant number, since it is smaller than the sum of its proper divisors (30436785800).

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

20908569880 is a wasteful number, since it uses less digits than its factorization.

20908569880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22540 (or 22536 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 20908569880 in words is "twenty billion, nine hundred eight million, five hundred sixty-nine thousand, eight hundred eighty".