20631203643 has 32 divisors (see below), whose sum is σ = 28325044224. Its totient is φ = 13353200000.

The previous prime is 20631203627. The next prime is 20631203647. The reversal of 20631203643 is 34630213602.

It is a cyclic number.

It is not a de Polignac number, because 20631203643 - 2⁴ = 20631203627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20631203643.

It is not an unprimeable number, because it can be changed into a prime (20631203647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4106473 + ... + 4111493.

It is an arithmetic number, because the mean of its divisors is an integer number (885157632).

Almost surely, 2^20631203643 is an apocalyptic number.

20631203643 is a deficient number, since it is larger than the sum of its proper divisors (7693840581).

20631203643 is a wasteful number, since it uses less digits than its factorization.

20631203643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387.

The product of its (nonzero) digits is 15552, while the sum is 30.

The spelling of 20631203643 in words is "twenty billion, six hundred thirty-one million, two hundred three thousand, six hundred forty-three".