20390941 has 2 divisors, whose sum is σ = 20390942. Its totient is φ = 20390940.

The previous prime is 20390911. The next prime is 20390947. The reversal of 20390941 is 14909302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 942841 = 4410^2 + 971^2 .

It is a cyclic number.

It is not a de Polignac number, because 20390941 - 2¹³ = 20382749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20390947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195470 + 10195471.

It is an arithmetic number, because the mean of its divisors is an integer number (10195471).

Almost surely, 2^20390941 is an apocalyptic number.

It is an amenable number.

20390941 is a deficient number, since it is larger than the sum of its proper divisors (1).

20390941 is an equidigital number, since it uses as much as digits as its factorization.

20390941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20390941 is about 4515.6329567404. The cubic root of 20390941 is about 273.1989899331.

The spelling of 20390941 in words is "twenty million, three hundred ninety thousand, nine hundred forty-one".