20864258 has 4 divisors (see below), whose sum is σ = 31296390. Its totient is φ = 10432128.

The previous prime is 20864231. The next prime is 20864281. The reversal of 20864258 is 85246802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14876449 + 5987809 = 3857^2 + 2447^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5216063 + ... + 5216066.

Almost surely, 2^20864258 is an apocalyptic number.

20864258 is a deficient number, since it is larger than the sum of its proper divisors (10432132).

20864258 is a wasteful number, since it uses less digits than its factorization.

20864258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432131.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 20864258 is about 4567.7410171769. The cubic root of 20864258 is about 275.2966847641.

The spelling of 20864258 in words is "twenty million, eight hundred sixty-four thousand, two hundred fifty-eight".