20165741 has 2 divisors, whose sum is σ = 20165742. Its totient is φ = 20165740.

The previous prime is 20165737. The next prime is 20165749. The reversal of 20165741 is 14756102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11195716 + 8970025 = 3346^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 20165741 - 2² = 20165737 is a prime.

It is a super-2 number, since 2×20165741² = 813314220158162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20165741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082870 + 10082871.

It is an arithmetic number, because the mean of its divisors is an integer number (10082871).

Almost surely, 2^20165741 is an apocalyptic number.

It is an amenable number.

20165741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165741 is an equidigital number, since it uses as much as digits as its factorization.

20165741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20165741 is about 4490.6281297832. The cubic root of 20165741 is about 272.1895170359.

The spelling of 20165741 in words is "twenty million, one hundred sixty-five thousand, seven hundred forty-one".