20931870971 has 8 divisors (see below), whose sum is σ = 23365809984. Its totient is φ = 18586438920.

The previous prime is 20931870901. The next prime is 20931870989. The reversal of 20931870971 is 17907813902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20931870971 - 2³⁴ = 3752001787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20931870901) 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, 22126241 + ... + 22127186.

It is an arithmetic number, because the mean of its divisors is an integer number (2920726248).

Almost surely, 2^20931870971 is an apocalyptic number.

20931870971 is a deficient number, since it is larger than the sum of its proper divisors (2433939013).

20931870971 is a wasteful number, since it uses less digits than its factorization.

20931870971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44253481.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 20931870971 in words is "twenty billion, nine hundred thirty-one million, eight hundred seventy thousand, nine hundred seventy-one".