20188291 has 2 divisors, whose sum is σ = 20188292. Its totient is φ = 20188290.

The previous prime is 20188261. The next prime is 20188297. The reversal of 20188291 is 19288102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20188291 - 2¹⁹ = 19664003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20188297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10094145 + 10094146.

It is an arithmetic number, because the mean of its divisors is an integer number (10094146).

Almost surely, 2^20188291 is an apocalyptic number.

20188291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20188291 is an equidigital number, since it uses as much as digits as its factorization.

20188291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 20188291 is about 4493.1382128753. The cubic root of 20188291 is about 272.2909363552.

The spelling of 20188291 in words is "twenty million, one hundred eighty-eight thousand, two hundred ninety-one".