20865041 has 2 divisors, whose sum is σ = 20865042. Its totient is φ = 20865040.

The previous prime is 20865017. The next prime is 20865067. The reversal of 20865041 is 14056802.

It is an a-pointer prime, because the next prime (20865067) can be obtained adding 20865041 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12103441 + 8761600 = 3479^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 20865041 - 2¹⁴ = 20848657 is a prime.

It is a Chen prime.

It is equal to p_1321964 and since 20865041 and 1321964 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20865041.

It is not a weakly prime, because it can be changed into another prime (20865541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432520 + 10432521.

It is an arithmetic number, because the mean of its divisors is an integer number (10432521).

Almost surely, 2^20865041 is an apocalyptic number.

It is an amenable number.

20865041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20865041 is an equidigital number, since it uses as much as digits as its factorization.

20865041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20865041 is about 4567.8267261357. The cubic root of 20865041 is about 275.3001285260.

The spelling of 20865041 in words is "twenty million, eight hundred sixty-five thousand, forty-one".