20631203647 has 2 divisors, whose sum is σ = 20631203648. Its totient is φ = 20631203646.

The previous prime is 20631203627. The next prime is 20631203687. The reversal of 20631203647 is 74630213602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20631203647 is a prime.

It is a super-2 number, since 2×20631203647² (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 (20631203617) 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, 10315601823 + 10315601824.

It is an arithmetic number, because the mean of its divisors is an integer number (10315601824).

Almost surely, 2^20631203647 is an apocalyptic number.

20631203647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631203647 is an equidigital number, since it uses as much as digits as its factorization.

20631203647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

The spelling of 20631203647 in words is "twenty billion, six hundred thirty-one million, two hundred three thousand, six hundred forty-seven".