20663655500 has 48 divisors (see below), whose sum is σ = 45150924000. Its totient is φ = 8261524800.

The previous prime is 20663655497. The next prime is 20663655539. The reversal of 20663655500 is 555636602.

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, 1185851 + ... + 1203149.

It is an arithmetic number, because the mean of its divisors is an integer number (940644250).

Almost surely, 2^20663655500 is an apocalyptic number.

20663655500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20663655500 is an abundant number, since it is smaller than the sum of its proper divisors (24487268500).

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

20663655500 is a wasteful number, since it uses less digits than its factorization.

20663655500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19707 (or 19695 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 20663655500 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred".