20656163631 has 8 divisors (see below), whose sum is σ = 27693715504. Its totient is φ = 13694693760.

The previous prime is 20656163623. The next prime is 20656163659. The reversal of 20656163631 is 13636165602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20656163631 - 2³ = 20656163623 is a prime.

It is a super-2 number, since 2×20656163631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20656163631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656143631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19019866 + ... + 19020951.

It is an arithmetic number, because the mean of its divisors is an integer number (3461714438).

Almost surely, 2^20656163631 is an apocalyptic number.

20656163631 is a deficient number, since it is larger than the sum of its proper divisors (7037551873).

20656163631 is a wasteful number, since it uses less digits than its factorization.

20656163631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38041001.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 20656163631 in words is "twenty billion, six hundred fifty-six million, one hundred sixty-three thousand, six hundred thirty-one".