20388892613 has 2 divisors, whose sum is σ = 20388892614. Its totient is φ = 20388892612.

The previous prime is 20388892567. The next prime is 20388892637. The reversal of 20388892613 is 31629888302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13463657089 + 6925235524 = 116033^2 + 83218^2 .

It is a cyclic number.

It is not a de Polignac number, because 20388892613 - 2²⁸ = 20120457157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20388892313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194446306 + 10194446307.

It is an arithmetic number, because the mean of its divisors is an integer number (10194446307).

Almost surely, 2^20388892613 is an apocalyptic number.

It is an amenable number.

20388892613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388892613 is an equidigital number, since it uses as much as digits as its factorization.

20388892613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 20388892613 in words is "twenty billion, three hundred eighty-eight million, eight hundred ninety-two thousand, six hundred thirteen".