20601157 has 2 divisors, whose sum is σ = 20601158. Its totient is φ = 20601156.

The previous prime is 20601079. The next prime is 20601167. The reversal of 20601157 is 75110602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15610401 + 4990756 = 3951^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 20601157 - 2⁷ = 20601029 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 (20601167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300578 + 10300579.

It is an arithmetic number, because the mean of its divisors is an integer number (10300579).

Almost surely, 2^20601157 is an apocalyptic number.

It is an amenable number.

20601157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601157 is an equidigital number, since it uses as much as digits as its factorization.

20601157 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 20601157 is about 4538.8497441532. The cubic root of 20601157 is about 274.1346107184.

Adding to 20601157 its reverse (75110602), we get a palindrome (95711759).

The spelling of 20601157 in words is "twenty million, six hundred one thousand, one hundred fifty-seven".