20010235639 has 2 divisors, whose sum is σ = 20010235640. Its totient is φ = 20010235638.

The previous prime is 20010235613. The next prime is 20010235649. The reversal of 20010235639 is 93653201002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20010235639 - 2¹⁵ = 20010202871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20010235639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010235649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005117819 + 10005117820.

It is an arithmetic number, because the mean of its divisors is an integer number (10005117820).

Almost surely, 2^20010235639 is an apocalyptic number.

20010235639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010235639 is an equidigital number, since it uses as much as digits as its factorization.

20010235639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The spelling of 20010235639 in words is "twenty billion, ten million, two hundred thirty-five thousand, six hundred thirty-nine".