20689872874 has 16 divisors (see below), whose sum is σ = 34948290816. Its totient is φ = 9101116800.

The previous prime is 20689872871. The next prime is 20689872881. The reversal of 20689872874 is 47827898602.

It is not an unprimeable number, because it can be changed into a prime (20689872871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15167847 + ... + 15169210.

It is an arithmetic number, because the mean of its divisors is an integer number (2184268176).

Almost surely, 2^20689872874 is an apocalyptic number.

20689872874 is a deficient number, since it is larger than the sum of its proper divisors (14258417942).

20689872874 is a wasteful number, since it uses less digits than its factorization.

20689872874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30337101.

The product of its (nonzero) digits is 21676032, while the sum is 61.

The spelling of 20689872874 in words is "twenty billion, six hundred eighty-nine million, eight hundred seventy-two thousand, eight hundred seventy-four".