20110091957 has 2 divisors, whose sum is σ = 20110091958. Its totient is φ = 20110091956.

The previous prime is 20110091909. The next prime is 20110091983. The reversal of 20110091957 is 75919001102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18644810116 + 1465281841 = 136546^2 + 38279^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110091957 - 2¹⁶ = 20110026421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110091657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055045978 + 10055045979.

It is an arithmetic number, because the mean of its divisors is an integer number (10055045979).

Almost surely, 2^20110091957 is an apocalyptic number.

It is an amenable number.

20110091957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110091957 is an equidigital number, since it uses as much as digits as its factorization.

20110091957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 35.

The spelling of 20110091957 in words is "twenty billion, one hundred ten million, ninety-one thousand, nine hundred fifty-seven".