20409403 has 8 divisors (see below), whose sum is σ = 23369472. Its totient is φ = 17460456.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409403 is 30490402.

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 20409403 - 2⁵ = 20409371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20409203) 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, 1626 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2921184).

Almost surely, 2^20409403 is an apocalyptic number.

20409403 is a deficient number, since it is larger than the sum of its proper divisors (2960069).

20409403 is an equidigital number, since it uses as much as digits as its factorization.

20409403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20409403 is about 4517.6767259289. The cubic root of 20409403 is about 273.2814167045.

Adding to 20409403 its reverse (30490402), we get a palindrome (50899805).

The spelling of 20409403 in words is "twenty million, four hundred nine thousand, four hundred three".