20589021 has 6 divisors (see below), whose sum is σ = 29739710. Its totient is φ = 13726008.

The previous prime is 20589017. The next prime is 20589029. The reversal of 20589021 is 12098502.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 68121 = 4530^2 + 261^2 .

It is not a de Polignac number, because 20589021 - 2² = 20589017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20589029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1143826 + ... + 1143843.

Almost surely, 2^20589021 is an apocalyptic number.

It is an amenable number.

20589021 is a deficient number, since it is larger than the sum of its proper divisors (9150689).

20589021 is a wasteful number, since it uses less digits than its factorization.

20589021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287675 (or 2287672 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20589021 is about 4537.5126446105. The cubic root of 20589021 is about 274.0807698729.

The spelling of 20589021 in words is "twenty million, five hundred eighty-nine thousand, twenty-one".