20965839 has 8 divisors (see below), whose sum is σ = 27996720. Its totient is φ = 13956096.

The previous prime is 20965831. The next prime is 20965843. The reversal of 20965839 is 93856902.

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

It is not a de Polignac number, because 20965839 - 2³ = 20965831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20965839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965831) 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, 2802 + ... + 7055.

It is an arithmetic number, because the mean of its divisors is an integer number (3499590).

Almost surely, 2^20965839 is an apocalyptic number.

20965839 is a deficient number, since it is larger than the sum of its proper divisors (7030881).

20965839 is an equidigital number, since it uses as much as digits as its factorization.

20965839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10569.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20965839 is about 4578.8469072464. The cubic root of 20965839 is about 275.7427370672.

The spelling of 20965839 in words is "twenty million, nine hundred sixty-five thousand, eight hundred thirty-nine".