20634431200 has 36 divisors (see below), whose sum is σ = 50373807120. Its totient is φ = 8253772160.

The previous prime is 20634431183. The next prime is 20634431227. The reversal of 20634431200 is 213443602.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12895720 + ... + 12897319.

It is an arithmetic number, because the mean of its divisors is an integer number (1399272420).

Almost surely, 2^20634431200 is an apocalyptic number.

20634431200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20634431200 is an abundant number, since it is smaller than the sum of its proper divisors (29739375920).

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

20634431200 is a wasteful number, since it uses less digits than its factorization.

20634431200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25793059 (or 25793046 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20634431200 its reverse (213443602), we get a palindrome (20847874802).

The spelling of 20634431200 in words is "twenty billion, six hundred thirty-four million, four hundred thirty-one thousand, two hundred".