20408349 has 16 divisors (see below), whose sum is σ = 30098432. Its totient is φ = 12218688.

The previous prime is 20408341. The next prime is 20408357. The reversal of 20408349 is 94380402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20408341) and next prime (20408357).

It is not a de Polignac number, because 20408349 - 2³ = 20408341 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5629 + ... + 8514.

It is an arithmetic number, because the mean of its divisors is an integer number (1881152).

Almost surely, 2^20408349 is an apocalyptic number.

It is an amenable number.

20408349 is a deficient number, since it is larger than the sum of its proper divisors (9690083).

20408349 is a wasteful number, since it uses less digits than its factorization.

20408349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14196.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20408349 is about 4517.5600715430. The cubic root of 20408349 is about 273.2767122786.

The spelling of 20408349 in words is "twenty million, four hundred eight thousand, three hundred forty-nine".