20106157 has 2 divisors, whose sum is σ = 20106158. Its totient is φ = 20106156.

The previous prime is 20106143. The next prime is 20106167. The reversal of 20106157 is 75160102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 9156676 = 3309^2 + 3026^2 .

It is a cyclic number.

It is not a de Polignac number, because 20106157 - 2²³ = 11717549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20106127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10053078 + 10053079.

It is an arithmetic number, because the mean of its divisors is an integer number (10053079).

Almost surely, 2^20106157 is an apocalyptic number.

It is an amenable number.

20106157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20106157 is an equidigital number, since it uses as much as digits as its factorization.

20106157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20106157 is about 4483.9889607357. The cubic root of 20106157 is about 271.9211718298.

Adding to 20106157 its reverse (75160102), we get a palindrome (95266259).

The spelling of 20106157 in words is "twenty million, one hundred six thousand, one hundred fifty-seven".