20731898971 has 12 divisors (see below), whose sum is σ = 24120870120. Its totient is φ = 17767125600.

The previous prime is 20731898947. The next prime is 20731898977. The reversal of 20731898971 is 17989813702.

It is not a de Polignac number, because 20731898971 - 2¹⁵ = 20731866203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20731898977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276696 + ... + 343546.

It is an arithmetic number, because the mean of its divisors is an integer number (2010072510).

Almost surely, 2^20731898971 is an apocalyptic number.

20731898971 is a deficient number, since it is larger than the sum of its proper divisors (3388971149).

20731898971 is an equidigital number, since it uses as much as digits as its factorization.

20731898971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73194 (or 73187 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 20731898971 in words is "twenty billion, seven hundred thirty-one million, eight hundred ninety-eight thousand, nine hundred seventy-one".