20165944 has 16 divisors (see below), whose sum is σ = 40035600. Its totient is φ = 9489792.

The previous prime is 20165941. The next prime is 20165947. The reversal of 20165944 is 44956102.

It is an interprime number because it is at equal distance from previous prime (20165941) and next prime (20165947).

It is a super-2 number, since 2×20165944² = 813330594822272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165941) 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 3 ways as a sum of consecutive naturals, for example, 74004 + ... + 74275.

It is an arithmetic number, because the mean of its divisors is an integer number (2502225).

Almost surely, 2^20165944 is an apocalyptic number.

It is an amenable number.

20165944 is a deficient number, since it is larger than the sum of its proper divisors (19869656).

20165944 is a wasteful number, since it uses less digits than its factorization.

20165944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148302 (or 148298 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20165944 is about 4490.6507323549. The cubic root of 20165944 is about 272.1904303719.

The spelling of 20165944 in words is "twenty million, one hundred sixty-five thousand, nine hundred forty-four".