20925139734 has 12 divisors (see below), whose sum is σ = 45337802796. Its totient is φ = 6975046572.

The previous prime is 20925139727. The next prime is 20925139757. The reversal of 20925139734 is 43793152902.

20925139734 is a `hidden beast` number, since 2 + 0 + 9 + 251 + 397 + 3 + 4 = 666.

It is a super-2 number, since 2×20925139734² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20925139734.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 581253864 + ... + 581253899.

It is an arithmetic number, because the mean of its divisors is an integer number (3778150233).

Almost surely, 2^20925139734 is an apocalyptic number.

20925139734 is an abundant number, since it is smaller than the sum of its proper divisors (24412663062).

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

20925139734 is a wasteful number, since it uses less digits than its factorization.

20925139734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162507771 (or 1162507768 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 20925139734 in words is "twenty billion, nine hundred twenty-five million, one hundred thirty-nine thousand, seven hundred thirty-four".