20544489 has 32 divisors (see below), whose sum is σ = 35297280. Its totient is φ = 11566800.

The previous prime is 20544487. The next prime is 20544521. The reversal of 20544489 is 98444502.

20544489 is a `hidden beast` number, since 205 + 4 + 448 + 9 = 666.

It is not a de Polignac number, because 20544489 - 2¹ = 20544487 is a prime.

It is a super-2 number, since 2×20544489² = 844152056542242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20544481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12654 + ... + 14184.

It is an arithmetic number, because the mean of its divisors is an integer number (1103040).

Almost surely, 2^20544489 is an apocalyptic number.

It is an amenable number.

20544489 is a deficient number, since it is larger than the sum of its proper divisors (14752791).

20544489 is a wasteful number, since it uses less digits than its factorization.

20544489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 20544489 is about 4532.6028945850. The cubic root of 20544489 is about 273.8830241084.

The spelling of 20544489 in words is "twenty million, five hundred forty-four thousand, four hundred eighty-nine".