20423443 has 8 divisors (see below), whose sum is σ = 21664368. Its totient is φ = 19186944.

The previous prime is 20423441. The next prime is 20423449. The reversal of 20423443 is 34432402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20423443 - 2¹ = 20423441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16980 + ... + 18142.

It is an arithmetic number, because the mean of its divisors is an integer number (2708046).

Almost surely, 2^20423443 is an apocalyptic number.

20423443 is a deficient number, since it is larger than the sum of its proper divisors (1240925).

20423443 is a wasteful number, since it uses less digits than its factorization.

20423443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 20423443 is about 4519.2303548281. The cubic root of 20423443 is about 273.3440674283.

Adding to 20423443 its reverse (34432402), we get a palindrome (54855845).

The spelling of 20423443 in words is "twenty million, four hundred twenty-three thousand, four hundred forty-three".