20423403 has 48 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 9789120.

The previous prime is 20423401. The next prime is 20423407. The reversal of 20423403 is 30432402.

It is not a de Polignac number, because 20423403 - 2¹ = 20423401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20423401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7876 + ... + 10142.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^20423403 is an apocalyptic number.

20423403 is a deficient number, since it is larger than the sum of its proper divisors (19203093).

20423403 is a wasteful number, since it uses less digits than its factorization.

20423403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304 (or 2301 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20423403 is about 4519.2259292936. The cubic root of 20423403 is about 273.3438889770.

Adding to 20423403 its reverse (30432402), we get a palindrome (50855805).

It can be divided in two parts, 2042 and 3403, that added together give a palindrome (5445).

The spelling of 20423403 in words is "twenty million, four hundred twenty-three thousand, four hundred three".