20868499 has 2 divisors, whose sum is σ = 20868500. Its totient is φ = 20868498.

The previous prime is 20868473. The next prime is 20868509. The reversal of 20868499 is 99486802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20868499 - 2¹⁹ = 20344211 is a prime.

It is a super-3 number, since 3×20868499³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20868439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434249 + 10434250.

It is an arithmetic number, because the mean of its divisors is an integer number (10434250).

Almost surely, 2^20868499 is an apocalyptic number.

20868499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868499 is an equidigital number, since it uses as much as digits as its factorization.

20868499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 20868499 is about 4568.2052274389. The cubic root of 20868499 is about 275.3153363443.

It can be divided in two parts, 2086 and 8499, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 20868499 in words is "twenty million, eight hundred sixty-eight thousand, four hundred ninety-nine".