20139245532 has 36 divisors (see below), whose sum is σ = 58180043376. Its totient is φ = 5754070080.

The previous prime is 20139245527. The next prime is 20139245549. The reversal of 20139245532 is 23554293102.

20139245532 is a `hidden beast` number, since 2 + 0 + 13 + 92 + 4 + 553 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39958569 + ... + 39959072.

It is an arithmetic number, because the mean of its divisors is an integer number (1616112316).

Almost surely, 2^20139245532 is an apocalyptic number.

It is an amenable number.

20139245532 is an abundant number, since it is smaller than the sum of its proper divisors (38040797844).

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

20139245532 is a wasteful number, since it uses less digits than its factorization.

20139245532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79917658 (or 79917653 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 20139245532 in words is "twenty billion, one hundred thirty-nine million, two hundred forty-five thousand, five hundred thirty-two".