20957070353 has 2 divisors, whose sum is σ = 20957070354. Its totient is φ = 20957070352.

The previous prime is 20957070307. The next prime is 20957070383. The reversal of 20957070353 is 35307075902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16063788049 + 4893282304 = 126743^2 + 69952^2 .

It is a cyclic number.

It is not a de Polignac number, because 20957070353 - 2¹² = 20957066257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20957070353.

It is not a weakly prime, because it can be changed into another prime (20957070383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10478535176 + 10478535177.

It is an arithmetic number, because the mean of its divisors is an integer number (10478535177).

Almost surely, 2^20957070353 is an apocalyptic number.

It is an amenable number.

20957070353 is a deficient number, since it is larger than the sum of its proper divisors (1).

20957070353 is an equidigital number, since it uses as much as digits as its factorization.

20957070353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 41.

The spelling of 20957070353 in words is "twenty billion, nine hundred fifty-seven million, seventy thousand, three hundred fifty-three".