20668734631 has 2 divisors, whose sum is σ = 20668734632. Its totient is φ = 20668734630.

The previous prime is 20668734599. The next prime is 20668734649. The reversal of 20668734631 is 13643786602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20668734631 - 2⁵ = 20668734599 is a prime.

It is a super-2 number, since 2×20668734631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20638734631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10334367315 + 10334367316.

It is an arithmetic number, because the mean of its divisors is an integer number (10334367316).

Almost surely, 2^20668734631 is an apocalyptic number.

20668734631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20668734631 is an equidigital number, since it uses as much as digits as its factorization.

20668734631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 20668734631 in words is "twenty billion, six hundred sixty-eight million, seven hundred thirty-four thousand, six hundred thirty-one".