20872589 has 2 divisors, whose sum is σ = 20872590. Its totient is φ = 20872588.

The previous prime is 20872571. The next prime is 20872601. The reversal of 20872589 is 98527802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 1247689 = 4430^2 + 1117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20872589 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 (20842589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436294 + 10436295.

It is an arithmetic number, because the mean of its divisors is an integer number (10436295).

Almost surely, 2^20872589 is an apocalyptic number.

It is an amenable number.

20872589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20872589 is an equidigital number, since it uses as much as digits as its factorization.

20872589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 20872589 is about 4568.6528649045. The cubic root of 20872589 is about 275.3333214450. Note that the first 4 decimals are identical.

The spelling of 20872589 in words is "twenty million, eight hundred seventy-two thousand, five hundred eighty-nine".