20265645 has 16 divisors (see below), whose sum is σ = 33835392. Its totient is φ = 10338240.

The previous prime is 20265629. The next prime is 20265667. The reversal of 20265645 is 54656202.

It is not a de Polignac number, because 20265645 - 2⁴ = 20265629 is a prime.

It is a super-3 number, since 3×20265645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29026 + ... + 29715.

It is an arithmetic number, because the mean of its divisors is an integer number (2114712).

Almost surely, 2^20265645 is an apocalyptic number.

It is an amenable number.

20265645 is a deficient number, since it is larger than the sum of its proper divisors (13569747).

20265645 is a wasteful number, since it uses less digits than its factorization.

20265645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58772.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 20265645 is about 4501.7379977071. The cubic root of 20265645 is about 272.6382655508.

It can be divided in two parts, 20265 and 645, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20265645 in words is "twenty million, two hundred sixty-five thousand, six hundred forty-five".