20530432544 has 12 divisors (see below), whose sum is σ = 40419289134. Its totient is φ = 10265216256.

The previous prime is 20530432543. The next prime is 20530432553. The reversal of 20530432544 is 44523403502.

It can be written as a sum of positive squares in only one way, i.e., 11046010000 + 9484422544 = 105100^2 + 97388^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 641576017 = 20530432544 / (2 + 0 + 5 + 3 + 0 + 4 + 3 + 2 + 5 + 4 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 20530432544.

It is not an unprimeable number, because it can be changed into a prime (20530432541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320787977 + ... + 320788040.

Almost surely, 2^20530432544 is an apocalyptic number.

It is an amenable number.

20530432544 is a deficient number, since it is larger than the sum of its proper divisors (19888856590).

20530432544 is an equidigital number, since it uses as much as digits as its factorization.

20530432544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641576027 (or 641576019 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 32.

The spelling of 20530432544 in words is "twenty billion, five hundred thirty million, four hundred thirty-two thousand, five hundred forty-four".