20602157 has 2 divisors, whose sum is σ = 20602158. Its totient is φ = 20602156.

The previous prime is 20602123. The next prime is 20602189. The reversal of 20602157 is 75120602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17732521 + 2869636 = 4211^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 20602157 - 2⁸ = 20601901 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 (20602357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301078 + 10301079.

It is an arithmetic number, because the mean of its divisors is an integer number (10301079).

Almost surely, 2^20602157 is an apocalyptic number.

It is an amenable number.

20602157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20602157 is an equidigital number, since it uses as much as digits as its factorization.

20602157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20602157 is about 4538.9599028852. The cubic root of 20602157 is about 274.1390462326.

Adding to 20602157 its reverse (75120602), we get a palindrome (95722759).

The spelling of 20602157 in words is "twenty million, six hundred two thousand, one hundred fifty-seven".