20442765 has 32 divisors (see below), whose sum is σ = 39352320. Its totient is φ = 8852544.

The previous prime is 20442749. The next prime is 20442769. The reversal of 20442765 is 56724402.

It is not a de Polignac number, because 20442765 - 2⁴ = 20442749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3129 + ... + 7118.

It is an arithmetic number, because the mean of its divisors is an integer number (1229760).

Almost surely, 2^20442765 is an apocalyptic number.

It is an amenable number.

20442765 is a deficient number, since it is larger than the sum of its proper divisors (18909555).

20442765 is a wasteful number, since it uses less digits than its factorization.

20442765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20442765 is about 4521.3676028388. The cubic root of 20442765 is about 273.4302411025.

The spelling of 20442765 in words is "twenty million, four hundred forty-two thousand, seven hundred sixty-five".