20571895680 has 128 divisors (see below), whose sum is σ = 74940526080. Its totient is φ = 4702144512.

The previous prime is 20571895679. The next prime is 20571895711. The reversal of 20571895680 is 8659817502.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751884 + ... + 778763.

It is an arithmetic number, because the mean of its divisors is an integer number (585472860).

Almost surely, 2^20571895680 is an apocalyptic number.

20571895680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20571895680 is an abundant number, since it is smaller than the sum of its proper divisors (54368630400).

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

20571895680 is a wasteful number, since it uses less digits than its factorization.

20571895680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530676 (or 1530664 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 20571895680 in words is "twenty billion, five hundred seventy-one million, eight hundred ninety-five thousand, six hundred eighty".