20303423503 has 16 divisors (see below), whose sum is σ = 23320800000. Its totient is φ = 17481804480.

The previous prime is 20303423473. The next prime is 20303423509. The reversal of 20303423503 is 30532430302.

It is a cyclic number.

It is not a de Polignac number, because 20303423503 - 2²¹ = 20301326351 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 (20303423509) 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 15 ways as a sum of consecutive naturals, for example, 1035075 + ... + 1054507.

It is an arithmetic number, because the mean of its divisors is an integer number (1457550000).

Almost surely, 2^20303423503 is an apocalyptic number.

20303423503 is a deficient number, since it is larger than the sum of its proper divisors (3017376497).

20303423503 is a wasteful number, since it uses less digits than its factorization.

20303423503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24462.

The product of its (nonzero) digits is 6480, while the sum is 25.

Adding to 20303423503 its reverse (30532430302), we get a palindrome (50835853805).

The spelling of 20303423503 in words is "twenty billion, three hundred three million, four hundred twenty-three thousand, five hundred three".