20430403 has 6 divisors (see below), whose sum is σ = 23766036. Its totient is φ = 17511732.

The previous prime is 20430373. The next prime is 20430409. The reversal of 20430403 is 30403402.

It is a de Polignac number, because none of the positive numbers 2^k-20430403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20430409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208425 + ... + 208522.

It is an arithmetic number, because the mean of its divisors is an integer number (3961006).

Almost surely, 2^20430403 is an apocalyptic number.

20430403 is a deficient number, since it is larger than the sum of its proper divisors (3335633).

20430403 is an equidigital number, since it uses as much as digits as its factorization.

20430403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416961 (or 416954 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20430403 is about 4520.0003318584. Note that the first 3 decimals coincide. The cubic root of 20430403 is about 273.3751144076.

Adding to 20430403 its reverse (30403402), we get a palindrome (50833805).

The spelling of 20430403 in words is "twenty million, four hundred thirty thousand, four hundred three".