20007706639 has 2 divisors, whose sum is σ = 20007706640. Its totient is φ = 20007706638.

The previous prime is 20007706603. The next prime is 20007706699. The reversal of 20007706639 is 93660770002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20007706639 - 2²⁵ = 19974152207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20007706699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10003853319 + 10003853320.

It is an arithmetic number, because the mean of its divisors is an integer number (10003853320).

Almost surely, 2^20007706639 is an apocalyptic number.

20007706639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20007706639 is an equidigital number, since it uses as much as digits as its factorization.

20007706639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 40.

The spelling of 20007706639 in words is "twenty billion, seven million, seven hundred six thousand, six hundred thirty-nine".