20165429 has 2 divisors, whose sum is σ = 20165430. Its totient is φ = 20165428.

The previous prime is 20165419. The next prime is 20165449. The reversal of 20165429 is 92456102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 5329 = 4490^2 + 73^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20165429 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082714 + 10082715.

It is an arithmetic number, because the mean of its divisors is an integer number (10082715).

Almost surely, 2^20165429 is an apocalyptic number.

It is an amenable number.

20165429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165429 is an equidigital number, since it uses as much as digits as its factorization.

20165429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20165429 is about 4490.5933906334. The cubic root of 20165429 is about 272.1881132762.

The spelling of 20165429 in words is "twenty million, one hundred sixty-five thousand, four hundred twenty-nine".