20724423 has 8 divisors (see below), whose sum is σ = 27659136. Its totient is φ = 13803000.

The previous prime is 20724397. The next prime is 20724427. The reversal of 20724423 is 32442702.

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

It is not a de Polignac number, because 20724423 - 2⁶ = 20724359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20724393 and 20724402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (3457392).

Almost surely, 2^20724423 is an apocalyptic number.

20724423 is a deficient number, since it is larger than the sum of its proper divisors (6934713).

20724423 is a wasteful number, since it uses less digits than its factorization.

20724423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6645.

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 20724423 is about 4552.4084834294. The cubic root of 20724423 is about 274.6802807752.

The spelling of 20724423 in words is "twenty million, seven hundred twenty-four thousand, four hundred twenty-three".