20164493 has 2 divisors, whose sum is σ = 20164494. Its totient is φ = 20164492.

The previous prime is 20164481. The next prime is 20164523. The reversal of 20164493 is 39446102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 3988009 = 4022^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164493 - 2⁶ = 20164429 is a prime.

It is equal to p_1280387 and since 20164493 and 1280387 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20164423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082246 + 10082247.

It is an arithmetic number, because the mean of its divisors is an integer number (10082247).

Almost surely, 2^20164493 is an apocalyptic number.

It is an amenable number.

20164493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164493 is an equidigital number, since it uses as much as digits as its factorization.

20164493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20164493 is about 4490.4891715714. The cubic root of 20164493 is about 272.1839019100.

The spelling of 20164493 in words is "twenty million, one hundred sixty-four thousand, four hundred ninety-three".