20923339 has 4 divisors (see below), whose sum is σ = 20938320. Its totient is φ = 20908360.

The previous prime is 20923337. The next prime is 20923349. The reversal of 20923339 is 93332902.

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

It is a cyclic number.

It is not a de Polignac number, because 20923339 - 2¹ = 20923337 is a prime.

It is a super-2 number, since 2×20923339² = 875572229817842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20923339.

It is not an unprimeable number, because it can be changed into a prime (20923337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152 + ... + 8269.

It is an arithmetic number, because the mean of its divisors is an integer number (5234580).

Almost surely, 2^20923339 is an apocalyptic number.

20923339 is a deficient number, since it is larger than the sum of its proper divisors (14981).

20923339 is a wasteful number, since it uses less digits than its factorization.

20923339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14980.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 20923339 is about 4574.2036465378. The cubic root of 20923339 is about 275.5562910131.

The spelling of 20923339 in words is "twenty million, nine hundred twenty-three thousand, three hundred thirty-nine".