20408229 has 12 divisors (see below), whose sum is σ = 29536416. Its totient is φ = 13578792.

The previous prime is 20408191. The next prime is 20408231. The reversal of 20408229 is 92280402.

It is not a de Polignac number, because 20408229 - 2¹² = 20404133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3352 + ... + 7214.

It is an arithmetic number, because the mean of its divisors is an integer number (2461368).

Almost surely, 2^20408229 is an apocalyptic number.

It is an amenable number.

20408229 is a deficient number, since it is larger than the sum of its proper divisors (9128187).

20408229 is a wasteful number, since it uses less digits than its factorization.

20408229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456 (or 4453 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20408229 is about 4517.5467900178. The cubic root of 20408229 is about 273.2761766601.

The spelling of 20408229 in words is "twenty million, four hundred eight thousand, two hundred twenty-nine".