20475639280 has 20 divisors (see below), whose sum is σ = 47605861512. Its totient is φ = 8190255680.

The previous prime is 20475639269. The next prime is 20475639329. The reversal of 20475639280 is 8293657402.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 20475639280.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 127972666 + ... + 127972825.

Almost surely, 2^20475639280 is an apocalyptic number.

20475639280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20475639280 is an abundant number, since it is smaller than the sum of its proper divisors (27130222232).

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

20475639280 is a wasteful number, since it uses less digits than its factorization.

20475639280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255945504 (or 255945498 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

It can be divided in two parts, 204756 and 39280, that added together give a square (244036 = 494²).

The spelling of 20475639280 in words is "twenty billion, four hundred seventy-five million, six hundred thirty-nine thousand, two hundred eighty".