20634831072 has 72 divisors (see below), whose sum is σ = 60573240000. Its totient is φ = 6656394240.

The previous prime is 20634831031. The next prime is 20634831097. The reversal of 20634831072 is 27013843602.

It is a happy number.

20634831072 is a `hidden beast` number, since 2 + 0 + 634 + 8 + 3 + 10 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1146697 + ... + 1164552.

It is an arithmetic number, because the mean of its divisors is an integer number (841295000).

Almost surely, 2^20634831072 is an apocalyptic number.

It is an amenable number.

20634831072 is an abundant number, since it is smaller than the sum of its proper divisors (39938408928).

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

20634831072 is a wasteful number, since it uses less digits than its factorization.

20634831072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311296 (or 2311285 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 20634831072 in words is "twenty billion, six hundred thirty-four million, eight hundred thirty-one thousand, seventy-two".