20916531630 has 24 divisors (see below), whose sum is σ = 54382982472. Its totient is φ = 5577741744.

The previous prime is 20916531593. The next prime is 20916531641. The reversal of 20916531630 is 3613561902.

20916531630 is a `hidden beast` number, since 2 + 0 + 9 + 16 + 5 + 3 + 1 + 630 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116202864 + ... + 116203043.

It is an arithmetic number, because the mean of its divisors is an integer number (2265957603).

Almost surely, 2^20916531630 is an apocalyptic number.

20916531630 is an abundant number, since it is smaller than the sum of its proper divisors (33466450842).

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

20916531630 is a wasteful number, since it uses less digits than its factorization.

20916531630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232405920 (or 232405917 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The spelling of 20916531630 in words is "twenty billion, nine hundred sixteen million, five hundred thirty-one thousand, six hundred thirty".