20012403 has 4 divisors (see below), whose sum is σ = 26683208. Its totient is φ = 13341600.

The previous prime is 20012401. The next prime is 20012411. The reversal of 20012403 is 30421002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20012403 - 2¹ = 20012401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335398 + ... + 3335403.

It is an arithmetic number, because the mean of its divisors is an integer number (6670802).

Almost surely, 2^20012403 is an apocalyptic number.

20012403 is a deficient number, since it is larger than the sum of its proper divisors (6670805).

20012403 is an equidigital number, since it uses as much as digits as its factorization.

20012403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670804.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20012403 is about 4473.5224376323. The cubic root of 20012403 is about 271.4978616005.

Adding to 20012403 its reverse (30421002), we get a palindrome (50433405).

The spelling of 20012403 in words is "twenty million, twelve thousand, four hundred three".