20007157 has 2 divisors, whose sum is σ = 20007158. Its totient is φ = 20007156.

The previous prime is 20007149. The next prime is 20007167. The reversal of 20007157 is 75170002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 62001 = 4466^2 + 249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20007157 - 2³ = 20007149 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 (20007107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10003578 + 10003579.

It is an arithmetic number, because the mean of its divisors is an integer number (10003579).

Almost surely, 2^20007157 is an apocalyptic number.

It is an amenable number.

20007157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20007157 is an equidigital number, since it uses as much as digits as its factorization.

20007157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 20007157 is about 4472.9360603523. The cubic root of 20007157 is about 271.4741362762.

Adding to 20007157 its reverse (75170002), we get a palindrome (95177159).

It can be divided in two parts, 20007 and 157, that added together give a square (20164 = 142²).

The spelling of 20007157 in words is "twenty million, seven thousand, one hundred fifty-seven".