20871591675 has 48 divisors (see below), whose sum is σ = 39626094720. Its totient is φ = 9586944000.

The previous prime is 20871591673. The next prime is 20871591749. The reversal of 20871591675 is 57619517802.

It is not a de Polignac number, because 20871591675 - 2¹ = 20871591673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20871591673) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 650086 + ... + 681435.

It is an arithmetic number, because the mean of its divisors is an integer number (825543640).

Almost surely, 2^20871591675 is an apocalyptic number.

20871591675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20871591675 is a deficient number, since it is larger than the sum of its proper divisors (18754503045).

20871591675 is a wasteful number, since it uses less digits than its factorization.

20871591675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331564 (or 1331559 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 51.

The spelling of 20871591675 in words is "twenty billion, eight hundred seventy-one million, five hundred ninety-one thousand, six hundred seventy-five".