20025704637 has 6 divisors (see below), whose sum is σ = 28926017822. Its totient is φ = 13350469752.

The previous prime is 20025704617. The next prime is 20025704687. The reversal of 20025704637 is 73640752002.

It is a happy number.

20025704637 is a `hidden beast` number, since 20 + 0 + 2 + 570 + 4 + 63 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19664172441 + 361532196 = 140229^2 + 19014^2 .

It is not a de Polignac number, because 20025704637 - 2⁸ = 20025704381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20025704617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112539138 + ... + 1112539155.

Almost surely, 2^20025704637 is an apocalyptic number.

It is an amenable number.

20025704637 is a deficient number, since it is larger than the sum of its proper divisors (8900313185).

20025704637 is a wasteful number, since it uses less digits than its factorization.

20025704637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225078299 (or 2225078296 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The spelling of 20025704637 in words is "twenty billion, twenty-five million, seven hundred four thousand, six hundred thirty-seven".