20631203644 has 24 divisors (see below), whose sum is σ = 36954575840. Its totient is φ = 10075497984.

The previous prime is 20631203627. The next prime is 20631203647. The reversal of 20631203644 is 44630213602.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 312909 + ... + 373060.

Almost surely, 2^20631203644 is an apocalyptic number.

It is an amenable number.

20631203644 is a deficient number, since it is larger than the sum of its proper divisors (16323372196).

20631203644 is a wasteful number, since it uses less digits than its factorization.

20631203644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686149 (or 686147 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The spelling of 20631203644 in words is "twenty billion, six hundred thirty-one million, two hundred three thousand, six hundred forty-four".