20122109957 has 2 divisors, whose sum is σ = 20122109958. Its totient is φ = 20122109956.

The previous prime is 20122109939. The next prime is 20122109989. The reversal of 20122109957 is 75990122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20104687681 + 17422276 = 141791^2 + 4174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122109957 - 2¹⁸ = 20121847813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20122109957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122109927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061054978 + 10061054979.

It is an arithmetic number, because the mean of its divisors is an integer number (10061054979).

Almost surely, 2^20122109957 is an apocalyptic number.

It is an amenable number.

20122109957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122109957 is an equidigital number, since it uses as much as digits as its factorization.

20122109957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 20122109957 in words is "twenty billion, one hundred twenty-two million, one hundred nine thousand, nine hundred fifty-seven".