20544440680 has 16 divisors (see below), whose sum is σ = 46224991620. Its totient is φ = 8217776256.

The previous prime is 20544440671. The next prime is 20544440699. The reversal of 20544440680 is 8604444502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19942523524 + 601917156 = 141218^2 + 24534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256805469 + ... + 256805548.

Almost surely, 2^20544440680 is an apocalyptic number.

20544440680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544440680 is an abundant number, since it is smaller than the sum of its proper divisors (25680550940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20544440680 is a wasteful number, since it uses less digits than its factorization.

20544440680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513611028 (or 513611024 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 37.

The spelling of 20544440680 in words is "twenty billion, five hundred forty-four million, four hundred forty thousand, six hundred eighty".