20497589 has 4 divisors (see below), whose sum is σ = 23425824. Its totient is φ = 17569356.

The previous prime is 20497579. The next prime is 20497601. The reversal of 20497589 is 98579402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98579402 = 2 ⋅49289701.

It is not a de Polignac number, because 20497589 - 2⁴ = 20497573 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 (20497579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464107 + ... + 1464120.

It is an arithmetic number, because the mean of its divisors is an integer number (5856456).

Almost surely, 2^20497589 is an apocalyptic number.

It is an amenable number.

20497589 is a deficient number, since it is larger than the sum of its proper divisors (2928235).

20497589 is an equidigital number, since it uses as much as digits as its factorization.

20497589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928234.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20497589 is about 4527.4263108305. The cubic root of 20497589 is about 273.6744539700.

The spelling of 20497589 in words is "twenty million, four hundred ninety-seven thousand, five hundred eighty-nine".