20377157 has 2 divisors, whose sum is σ = 20377158. Its totient is φ = 20377156.

The previous prime is 20377153. The next prime is 20377163. The reversal of 20377157 is 75177302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 961 = 4514^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 20377157 - 2² = 20377153 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 (20377153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188578 + 10188579.

It is an arithmetic number, because the mean of its divisors is an integer number (10188579).

Almost surely, 2^20377157 is an apocalyptic number.

It is an amenable number.

20377157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377157 is an equidigital number, since it uses as much as digits as its factorization.

20377157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 20377157 is about 4514.1064453555. The cubic root of 20377157 is about 273.1374164509.

The spelling of 20377157 in words is "twenty million, three hundred seventy-seven thousand, one hundred fifty-seven".