20508728544 has 72 divisors (see below), whose sum is σ = 60332814360. Its totient is φ = 6600507648.

The previous prime is 20508728533. The next prime is 20508728563. The reversal of 20508728544 is 44582780502.

20508728544 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 87 + 28 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 20508728544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1219422 + ... + 1236125.

It is an arithmetic number, because the mean of its divisors is an integer number (837955755).

Almost surely, 2^20508728544 is an apocalyptic number.

20508728544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20508728544 is an abundant number, since it is smaller than the sum of its proper divisors (39824085816).

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

20508728544 is a wasteful number, since it uses less digits than its factorization.

20508728544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455592 (or 2455581 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 45.

The spelling of 20508728544 in words is "twenty billion, five hundred eight million, seven hundred twenty-eight thousand, five hundred forty-four".