20424430 has 32 divisors (see below), whose sum is σ = 41680800. Its totient is φ = 7143552.

The previous prime is 20424427. The next prime is 20424431. The reversal of 20424430 is 3442402.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 20424398 and 20424407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1665 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (1302525).

Almost surely, 2^20424430 is an apocalyptic number.

20424430 is an abundant number, since it is smaller than the sum of its proper divisors (21256370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20424430 is a wasteful number, since it uses less digits than its factorization.

20424430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8308.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20424430 is about 4519.3395535189. The cubic root of 20424430 is about 273.3484706403.

Adding to 20424430 its reverse (3442402), we get a palindrome (23866832).

The spelling of 20424430 in words is "twenty million, four hundred twenty-four thousand, four hundred thirty".