20438303 has 4 divisors (see below), whose sum is σ = 20573808. Its totient is φ = 20302800.

The previous prime is 20438291. The next prime is 20438311. The reversal of 20438303 is 30383402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20438303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67526 + ... + 67827.

It is an arithmetic number, because the mean of its divisors is an integer number (5143452).

Almost surely, 2^20438303 is an apocalyptic number.

20438303 is a deficient number, since it is larger than the sum of its proper divisors (135505).

20438303 is a wasteful number, since it uses less digits than its factorization.

20438303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135504.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20438303 is about 4520.8741411369. The cubic root of 20438303 is about 273.4103459707.

The spelling of 20438303 in words is "twenty million, four hundred thirty-eight thousand, three hundred three".