20965863 has 4 divisors (see below), whose sum is σ = 27954488. Its totient is φ = 13977240.

The previous prime is 20965849. The next prime is 20965891. The reversal of 20965863 is 36856902.

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

It is not a de Polignac number, because 20965863 - 2⁵ = 20965831 is a prime.

It is a super-2 number, since 2×20965863² = 879134822669538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965843) 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, 3494308 + ... + 3494313.

It is an arithmetic number, because the mean of its divisors is an integer number (6988622).

Almost surely, 2^20965863 is an apocalyptic number.

20965863 is a deficient number, since it is larger than the sum of its proper divisors (6988625).

20965863 is an equidigital number, since it uses as much as digits as its factorization.

20965863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988624.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20965863 is about 4578.8495279928. The cubic root of 20965863 is about 275.7428422832.

The spelling of 20965863 in words is "twenty million, nine hundred sixty-five thousand, eight hundred sixty-three".