20165023 has 4 divisors (see below), whose sum is σ = 21226360. Its totient is φ = 19103688.

The previous prime is 20165017. The next prime is 20165027. The reversal of 20165023 is 32056102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20165023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1061317 = 20165023 / (2 + 0 + 1 + 6 + 5 + 0 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530640 + ... + 530677.

It is an arithmetic number, because the mean of its divisors is an integer number (5306590).

Almost surely, 2^20165023 is an apocalyptic number.

20165023 is a deficient number, since it is larger than the sum of its proper divisors (1061337).

20165023 is a wasteful number, since it uses less digits than its factorization.

20165023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061336.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20165023 is about 4490.5481847988. The cubic root of 20165023 is about 272.1862865671.

The spelling of 20165023 in words is "twenty million, one hundred sixty-five thousand, twenty-three".