20859489 has 24 divisors (see below), whose sum is σ = 34557120. Its totient is φ = 11877408.

The previous prime is 20859479. The next prime is 20859521. The reversal of 20859489 is 98495802.

It is not a de Polignac number, because 20859489 - 2⁷ = 20859361 is a prime.

It is a super-2 number, since 2×20859489² = 870236562682242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20859479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29067 + ... + 29775.

It is an arithmetic number, because the mean of its divisors is an integer number (1439880).

Almost surely, 2^20859489 is an apocalyptic number.

It is an amenable number.

20859489 is a deficient number, since it is larger than the sum of its proper divisors (13697631).

20859489 is a wasteful number, since it uses less digits than its factorization.

20859489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 20859489 is about 4567.2189568708. The cubic root of 20859489 is about 275.2757080627.

The spelling of 20859489 in words is "twenty million, eight hundred fifty-nine thousand, four hundred eighty-nine".