20864311 has 8 divisors (see below), whose sum is σ = 23244480. Its totient is φ = 18594912.

The previous prime is 20864303. The next prime is 20864323. The reversal of 20864311 is 11346802.

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 20864311 - 2³ = 20864303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864341) 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, 27295 + ... + 28048.

It is an arithmetic number, because the mean of its divisors is an integer number (2905560).

Almost surely, 2^20864311 is an apocalyptic number.

20864311 is a deficient number, since it is larger than the sum of its proper divisors (2380169).

20864311 is a wasteful number, since it uses less digits than its factorization.

20864311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55385.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20864311 is about 4567.7468187280. The cubic root of 20864311 is about 275.2969178695.

The spelling of 20864311 in words is "twenty million, eight hundred sixty-four thousand, three hundred eleven".