20005299 has 10 divisors (see below), whose sum is σ = 29884580. Its totient is φ = 13336812.

The previous prime is 20005291. The next prime is 20005301. The reversal of 20005299 is 99250002.

It is not a de Polignac number, because 20005299 - 2³ = 20005291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 123409 + ... + 123570.

It is an arithmetic number, because the mean of its divisors is an integer number (2988458).

Almost surely, 2^20005299 is an apocalyptic number.

20005299 is a deficient number, since it is larger than the sum of its proper divisors (9879281).

20005299 is an equidigital number, since it uses as much as digits as its factorization.

20005299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246991 (or 246982 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20005299 is about 4472.7283619733. The cubic root of 20005299 is about 271.4657323742.

The spelling of 20005299 in words is "twenty million, five thousand, two hundred ninety-nine".