20864489 has 8 divisors (see below), whose sum is σ = 22100640. Its totient is φ = 19642176.

The previous prime is 20864483. The next prime is 20864507. The reversal of 20864489 is 98446802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20864489 - 2¹² = 20860393 is a prime.

It is a super-2 number, since 2×20864489² = 870653802462242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20864483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272 + ... + 6465.

It is an arithmetic number, because the mean of its divisors is an integer number (2762580).

Almost surely, 2^20864489 is an apocalyptic number.

It is an amenable number.

20864489 is a deficient number, since it is larger than the sum of its proper divisors (1236151).

20864489 is a wasteful number, since it uses less digits than its factorization.

20864489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 20864489 is about 4567.7663031289. The cubic root of 20864489 is about 275.2977007488.

The spelling of 20864489 in words is "twenty million, eight hundred sixty-four thousand, four hundred eighty-nine".