20932157 has 2 divisors, whose sum is σ = 20932158. Its totient is φ = 20932156.

The previous prime is 20932147. The next prime is 20932159. The reversal of 20932157 is 75123902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 6446521 = 3806^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20932157 - 2⁴ = 20932141 is a prime.

Together with 20932159, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1325945 and since 20932157 and 1325945 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20932159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466078 + 10466079.

It is an arithmetic number, because the mean of its divisors is an integer number (10466079).

Almost surely, 2^20932157 is an apocalyptic number.

It is an amenable number.

20932157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20932157 is an equidigital number, since it uses as much as digits as its factorization.

20932157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20932157 is about 4575.1674286303. The cubic root of 20932157 is about 275.5949960227.

The spelling of 20932157 in words is "twenty million, nine hundred thirty-two thousand, one hundred fifty-seven".