20694589 has 2 divisors, whose sum is σ = 20694590. Its totient is φ = 20694588.

The previous prime is 20694571. The next prime is 20694601. The reversal of 20694589 is 98549602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 5616900 = 3883^2 + 2370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20694589 - 2¹¹ = 20692541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20694529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347294 + 10347295.

It is an arithmetic number, because the mean of its divisors is an integer number (10347295).

Almost surely, 2^20694589 is an apocalyptic number.

It is an amenable number.

20694589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20694589 is an equidigital number, since it uses as much as digits as its factorization.

20694589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20694589 is about 4549.1305762750. The cubic root of 20694589 is about 274.5484114513.

The spelling of 20694589 in words is "twenty million, six hundred ninety-four thousand, five hundred eighty-nine".