20165539 has 2 divisors, whose sum is σ = 20165540. Its totient is φ = 20165538.

The previous prime is 20165533. The next prime is 20165543. The reversal of 20165539 is 93556102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20165539 - 2⁵ = 20165507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20165539.

It is not a weakly prime, because it can be changed into another prime (20165533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082769 + 10082770.

It is an arithmetic number, because the mean of its divisors is an integer number (10082770).

Almost surely, 2^20165539 is an apocalyptic number.

20165539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165539 is an equidigital number, since it uses as much as digits as its factorization.

20165539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20165539 is about 4490.6056384412. The cubic root of 20165539 is about 272.1886081931.

The spelling of 20165539 in words is "twenty million, one hundred sixty-five thousand, five hundred thirty-nine".