20604020639 has 2 divisors, whose sum is σ = 20604020640. Its totient is φ = 20604020638.

The previous prime is 20604020627. The next prime is 20604020669. The reversal of 20604020639 is 93602040602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20604020639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20604020669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302010319 + 10302010320.

It is an arithmetic number, because the mean of its divisors is an integer number (10302010320).

Almost surely, 2^20604020639 is an apocalyptic number.

20604020639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604020639 is an equidigital number, since it uses as much as digits as its factorization.

20604020639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 20604020639 in words is "twenty billion, six hundred four million, twenty thousand, six hundred thirty-nine".