20165157 has 6 divisors (see below), whose sum is σ = 29127462. Its totient is φ = 13443432.

The previous prime is 20165149. The next prime is 20165161. The reversal of 20165157 is 75156102.

20165157 is a `hidden beast` number, since 2 + 0 + 1 + 651 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 9235521 = 3306^2 + 3039^2 .

It is not a de Polignac number, because 20165157 - 2³ = 20165149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20165157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120278 + ... + 1120295.

It is an arithmetic number, because the mean of its divisors is an integer number (4854577).

Almost surely, 2^20165157 is an apocalyptic number.

It is an amenable number.

20165157 is a deficient number, since it is larger than the sum of its proper divisors (8962305).

20165157 is a wasteful number, since it uses less digits than its factorization.

20165157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240579 (or 2240576 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 20165157 is about 4490.5631050014. The cubic root of 20165157 is about 272.1868894738.

The spelling of 20165157 in words is "twenty million, one hundred sixty-five thousand, one hundred fifty-seven".