20634999888 has 80 divisors (see below), whose sum is σ = 53873891136. Its totient is φ = 6805585920.

The previous prime is 20634999887. The next prime is 20634999901. The reversal of 20634999888 is 88899943602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634999887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746256 + ... + 1758032.

Almost surely, 2^20634999888 is an apocalyptic number.

It is an amenable number.

20634999888 is an abundant number, since it is smaller than the sum of its proper divisors (33238891248).

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

20634999888 is a wasteful number, since it uses less digits than its factorization.

20634999888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172 (or 12166 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 66.

The spelling of 20634999888 in words is "twenty billion, six hundred thirty-four million, nine hundred ninety-nine thousand, eight hundred eighty-eight".