20634440360 has 16 divisors (see below), whose sum is σ = 46427490900. Its totient is φ = 8253776128.

The previous prime is 20634440327. The next prime is 20634440389. The reversal of 20634440360 is 6304443602.

It can be written as a sum of positive squares in 2 ways, for example, as 20230510756 + 403929604 = 142234^2 + 20098^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257930465 + ... + 257930544.

Almost surely, 2^20634440360 is an apocalyptic number.

20634440360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20634440360 is an abundant number, since it is smaller than the sum of its proper divisors (25793050540).

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

20634440360 is a wasteful number, since it uses less digits than its factorization.

20634440360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515861020 (or 515861016 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 20634440360 its reverse (6304443602), we get a palindrome (26938883962).

The spelling of 20634440360 in words is "twenty billion, six hundred thirty-four million, four hundred forty thousand, three hundred sixty".