20646735400 has 48 divisors (see below), whose sum is σ = 48052951200. Its totient is φ = 8250214080.

The previous prime is 20646735371. The next prime is 20646735401. The reversal of 20646735400 is 453764602.

It is a super-2 number, since 2×20646735400² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20646735400.

It is not an unprimeable number, because it can be changed into a prime (20646735401) 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, 144091 + ... + 249109.

It is an arithmetic number, because the mean of its divisors is an integer number (1001103150).

Almost surely, 2^20646735400 is an apocalyptic number.

20646735400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20646735400 is an abundant number, since it is smaller than the sum of its proper divisors (27406215800).

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

20646735400 is a wasteful number, since it uses less digits than its factorization.

20646735400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106018 (or 106009 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 20646735400 in words is "twenty billion, six hundred forty-six million, seven hundred thirty-five thousand, four hundred".