20265666 has 32 divisors (see below), whose sum is σ = 45178560. Its totient is φ = 6022656.

The previous prime is 20265629. The next prime is 20265667. The reversal of 20265666 is 66656202.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20265667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3291 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (1411830).

Almost surely, 2^20265666 is an apocalyptic number.

20265666 is an abundant number, since it is smaller than the sum of its proper divisors (24912894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20265666 is a wasteful number, since it uses less digits than its factorization.

20265666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10498.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 20265666 is about 4501.7403301390. The cubic root of 20265666 is about 272.6383597233.

The spelling of 20265666 in words is "twenty million, two hundred sixty-five thousand, six hundred sixty-six".