20265541 has 4 divisors (see below), whose sum is σ = 20315500. Its totient is φ = 20215584.

The previous prime is 20265523. The next prime is 20265551. The reversal of 20265541 is 14556202.

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 17850625 + 2414916 = 4225^2 + 1554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20265541 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 (20265551) 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, 24366 + ... + 25183.

It is an arithmetic number, because the mean of its divisors is an integer number (5078875).

Almost surely, 2^20265541 is an apocalyptic number.

It is an amenable number.

20265541 is a deficient number, since it is larger than the sum of its proper divisors (49959).

20265541 is an equidigital number, since it uses as much as digits as its factorization.

20265541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49958.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20265541 is about 4501.7264465980. The cubic root of 20265541 is about 272.6377991715.

The spelling of 20265541 in words is "twenty million, two hundred sixty-five thousand, five hundred forty-one".