20544563631 has 32 divisors (see below), whose sum is σ = 30336104448. Its totient is φ = 12301329920.

The previous prime is 20544563623. The next prime is 20544563671. The reversal of 20544563631 is 13636544502.

It is a cyclic number.

It is not a de Polignac number, because 20544563631 - 2³ = 20544563623 is a prime.

It is a super-2 number, since 2×20544563631² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20544563631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544563671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 485245 + ... + 525881.

It is an arithmetic number, because the mean of its divisors is an integer number (948003264).

Almost surely, 2^20544563631 is an apocalyptic number.

20544563631 is a deficient number, since it is larger than the sum of its proper divisors (9791540817).

20544563631 is a wasteful number, since it uses less digits than its factorization.

20544563631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41111.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 20544563631 in words is "twenty billion, five hundred forty-four million, five hundred sixty-three thousand, six hundred thirty-one".