20606565631 has 2 divisors, whose sum is σ = 20606565632. Its totient is φ = 20606565630.

The previous prime is 20606565607. The next prime is 20606565689. The reversal of 20606565631 is 13656560602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20606565631 - 2⁷ = 20606565503 is a prime.

It is a super-2 number, since 2×20606565631² (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 (20606565131) 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, 10303282815 + 10303282816.

It is an arithmetic number, because the mean of its divisors is an integer number (10303282816).

Almost surely, 2^20606565631 is an apocalyptic number.

20606565631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606565631 is an equidigital number, since it uses as much as digits as its factorization.

20606565631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 20606565631 in words is "twenty billion, six hundred six million, five hundred sixty-five thousand, six hundred thirty-one".