20971587900 has 36 divisors (see below), whose sum is σ = 60677795192. Its totient is φ = 5592423360.

The previous prime is 20971587899. The next prime is 20971587961. The reversal of 20971587900 is 978517902.

It is a self number, because there is not a number n which added to its sum of digits gives 20971587900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34952347 + ... + 34952946.

Almost surely, 2^20971587900 is an apocalyptic number.

20971587900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20971587900 is an abundant number, since it is smaller than the sum of its proper divisors (39706207292).

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

20971587900 is a wasteful number, since it uses less digits than its factorization.

20971587900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69905310 (or 69905303 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 20971587900 in words is "twenty billion, nine hundred seventy-one million, five hundred eighty-seven thousand, nine hundred".