20864233 has 6 divisors (see below), whose sum is σ = 22592814. Its totient is φ = 19259136.

The previous prime is 20864231. The next prime is 20864281. The reversal of 20864233 is 33246802.

It can be written as a sum of positive squares in 3 ways, for example, as 2442969 + 18421264 = 1563^2 + 4292^2 .

It is not a de Polignac number, because 20864233 - 2¹ = 20864231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20864231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61560 + ... + 61897.

It is an arithmetic number, because the mean of its divisors is an integer number (3765469).

Almost surely, 2^20864233 is an apocalyptic number.

It is an amenable number.

20864233 is a deficient number, since it is larger than the sum of its proper divisors (1728581).

20864233 is a wasteful number, since it uses less digits than its factorization.

20864233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123483 (or 123470 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20864233 is about 4567.7382805936. The cubic root of 20864233 is about 275.2965748086.

The spelling of 20864233 in words is "twenty million, eight hundred sixty-four thousand, two hundred thirty-three".