20466689 has 2 divisors, whose sum is σ = 20466690. Its totient is φ = 20466688.

The previous prime is 20466679. The next prime is 20466697. The reversal of 20466689 is 98666402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 3591025 = 4108^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466689 - 2²⁴ = 3689473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20466679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233344 + 10233345.

It is an arithmetic number, because the mean of its divisors is an integer number (10233345).

Almost surely, 2^20466689 is an apocalyptic number.

It is an amenable number.

20466689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466689 is an equidigital number, since it uses as much as digits as its factorization.

20466689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 20466689 is about 4524.0124889306. The cubic root of 20466689 is about 273.5368639087.

The spelling of 20466689 in words is "twenty million, four hundred sixty-six thousand, six hundred eighty-nine".