20550604631 has 4 divisors (see below), whose sum is σ = 21259246200. Its totient is φ = 19841963064.

The previous prime is 20550604601. The next prime is 20550604637. The reversal of 20550604631 is 13640605502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20550604631 is a prime.

It is a super-2 number, since 2×20550604631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550604637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354320741 + ... + 354320798.

It is an arithmetic number, because the mean of its divisors is an integer number (5314811550).

Almost surely, 2^20550604631 is an apocalyptic number.

20550604631 is a deficient number, since it is larger than the sum of its proper divisors (708641569).

20550604631 is an equidigital number, since it uses as much as digits as its factorization.

20550604631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708641568.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 20550604631 in words is "twenty billion, five hundred fifty million, six hundred four thousand, six hundred thirty-one".