20413209 has 16 divisors (see below), whose sum is σ = 29218752. Its totient is φ = 12630528.

The previous prime is 20413199. The next prime is 20413219. The reversal of 20413209 is 90231402.

It is an interprime number because it is at equal distance from previous prime (20413199) and next prime (20413219).

It is not a de Polignac number, because 20413209 - 2⁵ = 20413177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20413219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 982 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (1826172).

Almost surely, 2^20413209 is an apocalyptic number.

It is an amenable number.

20413209 is a deficient number, since it is larger than the sum of its proper divisors (8805543).

20413209 is a wasteful number, since it uses less digits than its factorization.

20413209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5576.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20413209 is about 4518.0979405055. The cubic root of 20413209 is about 273.2984030649.

The spelling of 20413209 in words is "twenty million, four hundred thirteen thousand, two hundred nine".