20839157 has 2 divisors, whose sum is σ = 20839158. Its totient is φ = 20839156.

The previous prime is 20839141. The next prime is 20839187. The reversal of 20839157 is 75193802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 2937796 = 4231^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20839157 - 2⁴ = 20839141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20839187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419578 + 10419579.

It is an arithmetic number, because the mean of its divisors is an integer number (10419579).

Almost surely, 2^20839157 is an apocalyptic number.

It is an amenable number.

20839157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20839157 is an equidigital number, since it uses as much as digits as its factorization.

20839157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20839157 is about 4564.9925520202. The cubic root of 20839157 is about 275.1862407841.

It can be divided in two parts, 20839 and 157, that multiplied together give a palindrome (3271723).

The spelling of 20839157 in words is "twenty million, eight hundred thirty-nine thousand, one hundred fifty-seven".