20631989040 has 160 divisors (see below), whose sum is σ = 72504526080. Its totient is φ = 4811332608.

The previous prime is 20631989029. The next prime is 20631989047. The reversal of 20631989040 is 4098913602.

It is a junction number, because it is equal to n+sod(n) for n = 20631988983 and 20631989001.

It is not an unprimeable number, because it can be changed into a prime (20631989047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114742 + ... + 233301.

It is an arithmetic number, because the mean of its divisors is an integer number (453153288).

Almost surely, 2^20631989040 is an apocalyptic number.

20631989040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20631989040 is an abundant number, since it is smaller than the sum of its proper divisors (51872537040).

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

20631989040 is a wasteful number, since it uses less digits than its factorization.

20631989040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348091 (or 348085 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 20631989040 in words is "twenty billion, six hundred thirty-one million, nine hundred eighty-nine thousand, forty".