20444665 has 16 divisors (see below), whose sum is σ = 25945920. Its totient is φ = 15422400.

The previous prime is 20444639. The next prime is 20444689. The reversal of 20444665 is 56644402.

It is not a de Polignac number, because 20444665 - 2⁹ = 20444153 is a prime.

It is a super-3 number, since 3×20444665³ (a number of 23 digits) contains 333 as substring.

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, 28815 + ... + 29515.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^20444665 is an apocalyptic number.

It is an amenable number.

20444665 is a deficient number, since it is larger than the sum of its proper divisors (5501255).

20444665 is a wasteful number, since it uses less digits than its factorization.

20444665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 20444665 is about 4521.5777113746. The cubic root of 20444665 is about 273.4387119293.

The spelling of 20444665 in words is "twenty million, four hundred forty-four thousand, six hundred sixty-five".