20721885700 has 36 divisors (see below), whose sum is σ = 45000869760. Its totient is φ = 8282417440.

The previous prime is 20721885683. The next prime is 20721885739. The reversal of 20721885700 is 758812702.

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, 53349 + ... + 210451.

It is an arithmetic number, because the mean of its divisors is an integer number (1250024160).

Almost surely, 2^20721885700 is an apocalyptic number.

20721885700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20721885700 is an abundant number, since it is smaller than the sum of its proper divisors (24278984060).

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

20721885700 is a wasteful number, since it uses less digits than its factorization.

20721885700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158436 (or 158429 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The spelling of 20721885700 in words is "twenty billion, seven hundred twenty-one million, eight hundred eighty-five thousand, seven hundred".