20591377 has 2 divisors, whose sum is σ = 20591378. Its totient is φ = 20591376.

The previous prime is 20591359. The next prime is 20591407. The reversal of 20591377 is 77319502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16966161 + 3625216 = 4119^2 + 1904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20591377 is a prime.

It is a super-2 number, since 2×20591377² = 848009613512258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20591317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10295688 + 10295689.

It is an arithmetic number, because the mean of its divisors is an integer number (10295689).

Almost surely, 2^20591377 is an apocalyptic number.

It is an amenable number.

20591377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20591377 is an equidigital number, since it uses as much as digits as its factorization.

20591377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 20591377 is about 4537.7722507856. The cubic root of 20591377 is about 274.0912238209.

The spelling of 20591377 in words is "twenty million, five hundred ninety-one thousand, three hundred seventy-seven".