20887393 has 2 divisors, whose sum is σ = 20887394. Its totient is φ = 20887392.

The previous prime is 20887367. The next prime is 20887423. The reversal of 20887393 is 39378802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 1067089 = 4452^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 20887393 - 2¹⁷ = 20756321 is a prime.

It is not a weakly prime, because it can be changed into another prime (20887313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10443696 + 10443697.

It is an arithmetic number, because the mean of its divisors is an integer number (10443697).

Almost surely, 2^20887393 is an apocalyptic number.

It is an amenable number.

20887393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20887393 is an equidigital number, since it uses as much as digits as its factorization.

20887393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20887393 is about 4570.2727489724. The cubic root of 20887393 is about 275.3983999589.

The spelling of 20887393 in words is "twenty million, eight hundred eighty-seven thousand, three hundred ninety-three".