20399704800 has 72 divisors (see below), whose sum is σ = 66401046936. Its totient is φ = 5439920640.

The previous prime is 20399704799. The next prime is 20399704841. The reversal of 20399704800 is 840799302.

It is a super-2 number, since 2×20399704800² (a number of 21 digits) contains 22 as substring.

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, 4247539 + ... + 4252338.

It is an arithmetic number, because the mean of its divisors is an integer number (922236763).

Almost surely, 2^20399704800 is an apocalyptic number.

20399704800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20399704800 is an abundant number, since it is smaller than the sum of its proper divisors (46001342136).

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

20399704800 is a wasteful number, since it uses less digits than its factorization.

20399704800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8499900 (or 8499887 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 20399704800 in words is "twenty billion, three hundred ninety-nine million, seven hundred four thousand, eight hundred".