20210020931 has 2 divisors, whose sum is σ = 20210020932. Its totient is φ = 20210020930.

The previous prime is 20210020879. The next prime is 20210020967. The reversal of 20210020931 is 13902001202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210020931 is a prime.

It is a super-2 number, since 2×20210020931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210020531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105010465 + 10105010466.

It is an arithmetic number, because the mean of its divisors is an integer number (10105010466).

Almost surely, 2^20210020931 is an apocalyptic number.

20210020931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210020931 is an equidigital number, since it uses as much as digits as its factorization.

20210020931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 20210020931 in words is "twenty billion, two hundred ten million, twenty thousand, nine hundred thirty-one".