20404013 has 8 divisors (see below), whose sum is σ = 24332928. Its totient is φ = 16728624.

The previous prime is 20404009. The next prime is 20404039. The reversal of 20404013 is 31040402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20404013 - 2² = 20404009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63206 + ... + 63527.

It is an arithmetic number, because the mean of its divisors is an integer number (3041616).

Almost surely, 2^20404013 is an apocalyptic number.

20404013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20404013 is a deficient number, since it is larger than the sum of its proper divisors (3928915).

20404013 is a wasteful number, since it uses less digits than its factorization.

20404013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126763.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20404013 is about 4517.0801409760. The cubic root of 20404013 is about 273.2573572628.

Adding to 20404013 its reverse (31040402), we get a palindrome (51444415).

The spelling of 20404013 in words is "twenty million, four hundred four thousand, thirteen".