20165393 has 2 divisors, whose sum is σ = 20165394. Its totient is φ = 20165392.

The previous prime is 20165377. The next prime is 20165401. The reversal of 20165393 is 39356102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 380689 = 4448^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 20165393 - 2⁴ = 20165377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20165693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082696 + 10082697.

It is an arithmetic number, because the mean of its divisors is an integer number (10082697).

Almost surely, 2^20165393 is an apocalyptic number.

It is an amenable number.

20165393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165393 is an equidigital number, since it uses as much as digits as its factorization.

20165393 is an evil number, because the sum of its binary digits is even.

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

The square root of 20165393 is about 4490.5893822526. The cubic root of 20165393 is about 272.1879513030.

The spelling of 20165393 in words is "twenty million, one hundred sixty-five thousand, three hundred ninety-three".