20455157 has 2 divisors, whose sum is σ = 20455158. Its totient is φ = 20455156.

The previous prime is 20455139. The next prime is 20455163. The reversal of 20455157 is 75155402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 78961 = 4514^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455157 - 2⁸ = 20454901 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 (20455177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227578 + 10227579.

It is an arithmetic number, because the mean of its divisors is an integer number (10227579).

Almost surely, 2^20455157 is an apocalyptic number.

It is an amenable number.

20455157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455157 is an equidigital number, since it uses as much as digits as its factorization.

20455157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 20455157 is about 4522.7377770550. The cubic root of 20455157 is about 273.4854792781.

The spelling of 20455157 in words is "twenty million, four hundred fifty-five thousand, one hundred fifty-seven".