20288999 has 2 divisors, whose sum is σ = 20289000. Its totient is φ = 20288998.

The previous prime is 20288977. The next prime is 20289011. The reversal of 20288999 is 99988202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20288999 - 2¹² = 20284903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20288909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144499 + 10144500.

It is an arithmetic number, because the mean of its divisors is an integer number (10144500).

Almost surely, 2^20288999 is an apocalyptic number.

20288999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20288999 is an equidigital number, since it uses as much as digits as its factorization.

20288999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 20288999 is about 4504.3311379160. The cubic root of 20288999 is about 272.7429542128.

The spelling of 20288999 in words is "twenty million, two hundred eighty-eight thousand, nine hundred ninety-nine".