20263945 has 12 divisors (see below), whose sum is σ = 26332236. Its totient is φ = 14963520.

The previous prime is 20263939. The next prime is 20263961. The reversal of 20263945 is 54936202.

It can be written as a sum of positive squares in 6 ways, for example, as 11431161 + 8832784 = 3381^2 + 2972^2 .

It is not a de Polignac number, because 20263945 - 2⁵ = 20263913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11146 + ... + 12835.

It is an arithmetic number, because the mean of its divisors is an integer number (2194353).

Almost surely, 2^20263945 is an apocalyptic number.

It is an amenable number.

20263945 is a deficient number, since it is larger than the sum of its proper divisors (6068291).

20263945 is a wasteful number, since it uses less digits than its factorization.

20263945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24012 (or 23999 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20263945 is about 4501.5491777831. The cubic root of 20263945 is about 272.6306418439.

The spelling of 20263945 in words is "twenty million, two hundred sixty-three thousand, nine hundred forty-five".