20931000353 has 2 divisors, whose sum is σ = 20931000354. Its totient is φ = 20931000352.

The previous prime is 20931000301. The next prime is 20931000367. The reversal of 20931000353 is 35300013902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19062772624 + 1868227729 = 138068^2 + 43223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20931000353 - 2⁶ = 20931000289 is a prime.

It is a super-2 number, since 2×20931000353² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20931000383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465500176 + 10465500177.

It is an arithmetic number, because the mean of its divisors is an integer number (10465500177).

Almost surely, 2^20931000353 is an apocalyptic number.

It is an amenable number.

20931000353 is a deficient number, since it is larger than the sum of its proper divisors (1).

20931000353 is an equidigital number, since it uses as much as digits as its factorization.

20931000353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 26.

The spelling of 20931000353 in words is "twenty billion, nine hundred thirty-one million, three hundred fifty-three", and thus it is an aban number.