20165445 has 12 divisors (see below), whose sum is σ = 34953516. Its totient is φ = 10754880.

The previous prime is 20165429. The next prime is 20165449. The reversal of 20165445 is 54456102.

20165445 is a `hidden beast` number, since 2 + 0 + 1 + 654 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13905441 + 6260004 = 3729^2 + 2502^2 .

It is not a de Polignac number, because 20165445 - 2⁴ = 20165429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224016 + ... + 224105.

It is an arithmetic number, because the mean of its divisors is an integer number (2912793).

Almost surely, 2^20165445 is an apocalyptic number.

It is an amenable number.

20165445 is a deficient number, since it is larger than the sum of its proper divisors (14788071).

20165445 is a wasteful number, since it uses less digits than its factorization.

20165445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448132 (or 448129 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20165445 is about 4490.5951721348. The cubic root of 20165445 is about 272.1881852642.

The spelling of 20165445 in words is "twenty million, one hundred sixty-five thousand, four hundred forty-five".