20345403 has 12 divisors (see below), whose sum is σ = 29375160. Its totient is φ = 12519936.

The previous prime is 20345359. The next prime is 20345411. The reversal of 20345403 is 30454302.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20345403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20345403.

It is not an unprimeable number, because it can be changed into a prime (20345453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19558 + ... + 20571.

It is an arithmetic number, because the mean of its divisors is an integer number (2447930).

Almost surely, 2^20345403 is an apocalyptic number.

20345403 is a deficient number, since it is larger than the sum of its proper divisors (9029757).

20345403 is a wasteful number, since it uses less digits than its factorization.

20345403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40158 (or 40145 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20345403 is about 4510.5878774280. The cubic root of 20345403 is about 272.9954647773.

Adding to 20345403 its reverse (30454302), we get a palindrome (50799705).

The spelling of 20345403 in words is "twenty million, three hundred forty-five thousand, four hundred three".