20456636139 has 12 divisors (see below), whose sum is σ = 29571960600. Its totient is φ = 13626917664.

The previous prime is 20456636117. The next prime is 20456636147. The reversal of 20456636139 is 93163665402.

20456636139 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 6 + 636 + 1 + 3 + 9 = 666.

It is not a de Polignac number, because 20456636139 - 2¹⁵ = 20456603371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20456636094 and 20456636103.

It is not an unprimeable number, because it can be changed into a prime (20456636339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 891354 + ... + 914015.

It is an arithmetic number, because the mean of its divisors is an integer number (2464330050).

Almost surely, 2^20456636139 is an apocalyptic number.

20456636139 is a deficient number, since it is larger than the sum of its proper divisors (9115324461).

20456636139 is a wasteful number, since it uses less digits than its factorization.

20456636139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806634 (or 1806631 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 20456636139 in words is "twenty billion, four hundred fifty-six million, six hundred thirty-six thousand, one hundred thirty-nine".