20313403 has 4 divisors (see below), whose sum is σ = 22160088. Its totient is φ = 18466720.

The previous prime is 20313389. The next prime is 20313421. The reversal of 20313403 is 30431302.

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

It is a cyclic number.

It is not a de Polignac number, because 20313403 - 2¹³ = 20305211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20313473) 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, 923326 + ... + 923347.

It is an arithmetic number, because the mean of its divisors is an integer number (5540022).

Almost surely, 2^20313403 is an apocalyptic number.

20313403 is a deficient number, since it is larger than the sum of its proper divisors (1846685).

20313403 is a wasteful number, since it uses less digits than its factorization.

20313403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846684.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20313403 is about 4507.0392720721. The cubic root of 20313403 is about 272.8522638962.

Adding to 20313403 its reverse (30431302), we get a palindrome (50744705).

The spelling of 20313403 in words is "twenty million, three hundred thirteen thousand, four hundred three".