20165933 has 4 divisors (see below), whose sum is σ = 20861340. Its totient is φ = 19470528.

The previous prime is 20165921. The next prime is 20165941. The reversal of 20165933 is 33956102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11744329 + 8421604 = 3427^2 + 2902^2 .

It is a cyclic number.

It is not a de Polignac number, because 20165933 - 2⁶ = 20165869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 695377 = 20165933 / (2 + 0 + 1 + 6 + 5 + 9 + 3 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20165896 and 20165905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165983) 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, 347660 + ... + 347717.

It is an arithmetic number, because the mean of its divisors is an integer number (5215335).

Almost surely, 2^20165933 is an apocalyptic number.

It is an amenable number.

20165933 is a deficient number, since it is larger than the sum of its proper divisors (695407).

20165933 is an equidigital number, since it uses as much as digits as its factorization.

20165933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695406.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20165933 is about 4490.6495075880. The cubic root of 20165933 is about 272.1903808809.

The spelling of 20165933 in words is "twenty million, one hundred sixty-five thousand, nine hundred thirty-three".