20290961 has 2 divisors, whose sum is σ = 20290962. Its totient is φ = 20290960.

The previous prime is 20290951. The next prime is 20290967. The reversal of 20290961 is 16909202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 211600 = 4481^2 + 460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20290961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20290967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145480 + 10145481.

It is an arithmetic number, because the mean of its divisors is an integer number (10145481).

Almost surely, 2^20290961 is an apocalyptic number.

It is an amenable number.

20290961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20290961 is an equidigital number, since it uses as much as digits as its factorization.

20290961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20290961 is about 4504.5489230332. The cubic root of 20290961 is about 272.7517455850.

The spelling of 20290961 in words is "twenty million, two hundred ninety thousand, nine hundred sixty-one".