20955222157 has 2 divisors, whose sum is σ = 20955222158. Its totient is φ = 20955222156.

The previous prime is 20955222149. The next prime is 20955222161. The reversal of 20955222157 is 75122255902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20321642916 + 633579241 = 142554^2 + 25171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20955222157 - 2³ = 20955222149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20955222137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477611078 + 10477611079.

It is an arithmetic number, because the mean of its divisors is an integer number (10477611079).

Almost surely, 2^20955222157 is an apocalyptic number.

It is an amenable number.

20955222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955222157 is an equidigital number, since it uses as much as digits as its factorization.

20955222157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 20955222157 in words is "twenty billion, nine hundred fifty-five million, two hundred twenty-two thousand, one hundred fifty-seven".