20263885 has 4 divisors (see below), whose sum is σ = 24316668. Its totient is φ = 16211104.

The previous prime is 20263871. The next prime is 20263889. The reversal of 20263885 is 58836202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5541316 + 14722569 = 2354^2 + 3837^2 .

It is a cyclic number.

It is not a de Polignac number, because 20263885 - 2⁷ = 20263757 is a prime.

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 20263885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20263889) 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, 2026384 + ... + 2026393.

It is an arithmetic number, because the mean of its divisors is an integer number (6079167).

Almost surely, 2^20263885 is an apocalyptic number.

It is an amenable number.

20263885 is a deficient number, since it is larger than the sum of its proper divisors (4052783).

20263885 is an equidigital number, since it uses as much as digits as its factorization.

20263885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052782.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20263885 is about 4501.5425134058. The cubic root of 20263885 is about 272.6303727641.

The spelling of 20263885 in words is "twenty million, two hundred sixty-three thousand, eight hundred eighty-five".