20475715880 has 16 divisors (see below), whose sum is σ = 46070360820. Its totient is φ = 8190286336.

The previous prime is 20475715873. The next prime is 20475715913. The reversal of 20475715880 is 8851757402.

It can be written as a sum of positive squares in 2 ways, for example, as 19163972356 + 1311743524 = 138434^2 + 36218^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255946409 + ... + 255946488.

Almost surely, 2^20475715880 is an apocalyptic number.

20475715880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20475715880 is an abundant number, since it is smaller than the sum of its proper divisors (25594644940).

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

20475715880 is a wasteful number, since it uses less digits than its factorization.

20475715880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511892908 (or 511892904 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 47.

The spelling of 20475715880 in words is "twenty billion, four hundred seventy-five million, seven hundred fifteen thousand, eight hundred eighty".