20423459 has 4 divisors (see below), whose sum is σ = 23341104. Its totient is φ = 17505816.

The previous prime is 20423449. The next prime is 20423479. The reversal of 20423459 is 95432402.

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-20423459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423449) 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 3 ways as a sum of consecutive naturals, for example, 1458812 + ... + 1458825.

It is an arithmetic number, because the mean of its divisors is an integer number (5835276).

Almost surely, 2^20423459 is an apocalyptic number.

20423459 is a deficient number, since it is larger than the sum of its proper divisors (2917645).

20423459 is an equidigital number, since it uses as much as digits as its factorization.

20423459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917644.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20423459 is about 4519.2321250407. The cubic root of 20423459 is about 273.3441388087.

The spelling of 20423459 in words is "twenty million, four hundred twenty-three thousand, four hundred fifty-nine".