20589857 has 2 divisors, whose sum is σ = 20589858. Its totient is φ = 20589856.

The previous prime is 20589841. The next prime is 20589911. The reversal of 20589857 is 75898502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 1018081 = 4424^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 20589857 - 2⁴ = 20589841 is a prime.

It is a super-2 number, since 2×20589857² = 847884422560898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20589817) 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, 10294928 + 10294929.

It is an arithmetic number, because the mean of its divisors is an integer number (10294929).

Almost surely, 2^20589857 is an apocalyptic number.

It is an amenable number.

20589857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20589857 is an equidigital number, since it uses as much as digits as its factorization.

20589857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 20589857 is about 4537.6047646308. The cubic root of 20589857 is about 274.0844794296.

The spelling of 20589857 in words is "twenty million, five hundred eighty-nine thousand, eight hundred fifty-seven".