20401303 has 4 divisors (see below), whose sum is σ = 21970648. Its totient is φ = 18831960.

The previous prime is 20401291. The next prime is 20401321. The reversal of 20401303 is 30310402.

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 20401303 - 2²¹ = 18304151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1569331 = 20401303 / (2 + 0 + 4 + 0 + 1 + 3 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401333) 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, 784653 + ... + 784678.

It is an arithmetic number, because the mean of its divisors is an integer number (5492662).

Almost surely, 2^20401303 is an apocalyptic number.

20401303 is a deficient number, since it is larger than the sum of its proper divisors (1569345).

20401303 is a wasteful number, since it uses less digits than its factorization.

20401303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569344.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20401303 is about 4516.7801584757. The cubic root of 20401303 is about 273.2452589855.

Adding to 20401303 its reverse (30310402), we get a palindrome (50711705).

Subtracting 20401303 from its reverse (30310402), we obtain a palindrome (9909099).

The spelling of 20401303 in words is "twenty million, four hundred one thousand, three hundred three".