20258621 has 2 divisors, whose sum is σ = 20258622. Its totient is φ = 20258620.

The previous prime is 20258597. The next prime is 20258629. The reversal of 20258621 is 12685202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18156121 + 2102500 = 4261^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 20258621 - 2¹⁰ = 20257597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20258629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129310 + 10129311.

It is an arithmetic number, because the mean of its divisors is an integer number (10129311).

Almost surely, 2^20258621 is an apocalyptic number.

It is an amenable number.

20258621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20258621 is an equidigital number, since it uses as much as digits as its factorization.

20258621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20258621 is about 4500.9577869605. The cubic root of 20258621 is about 272.6067634287.

The spelling of 20258621 in words is "twenty million, two hundred fifty-eight thousand, six hundred twenty-one".