20445841 has 16 divisors (see below), whose sum is σ = 22977360. Its totient is φ = 18063360.

The previous prime is 20445823. The next prime is 20445851. The reversal of 20445841 is 14854402.

It can be written as a sum of positive squares in 8 ways, for example, as 1050625 + 19395216 = 1025^2 + 4404^2 .

It is a cyclic number.

It is not a de Polignac number, because 20445841 - 2¹¹ = 20443793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445851) 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, 72621 + ... + 72901.

It is an arithmetic number, because the mean of its divisors is an integer number (1436085).

Almost surely, 2^20445841 is an apocalyptic number.

It is an amenable number.

20445841 is a deficient number, since it is larger than the sum of its proper divisors (2531519).

20445841 is a wasteful number, since it uses less digits than its factorization.

20445841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 20445841 is about 4521.7077526085. The cubic root of 20445841 is about 273.4439546623.

The spelling of 20445841 in words is "twenty million, four hundred forty-five thousand, eight hundred forty-one".