20640400600 has 48 divisors (see below), whose sum is σ = 47999773800. Its totient is φ = 8254295040.

The previous prime is 20640400597. The next prime is 20640400609. The reversal of 20640400600 is 600404602.

It is a super-2 number, since 2×20640400600² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640400609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1179112 + ... + 1196488.

Almost surely, 2^20640400600 is an apocalyptic number.

20640400600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640400600 is an abundant number, since it is smaller than the sum of its proper divisors (27359373200).

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

20640400600 is a wasteful number, since it uses less digits than its factorization.

20640400600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23332 (or 23323 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The spelling of 20640400600 in words is "twenty billion, six hundred forty million, four hundred thousand, six hundred".