20042430 has 64 divisors (see below), whose sum is σ = 51867648. Its totient is φ = 4942080.

The previous prime is 20042417. The next prime is 20042443. The reversal of 20042430 is 3424002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20042417) and next prime (20042443).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20922 + ... + 21858.

It is an arithmetic number, because the mean of its divisors is an integer number (810432).

Almost surely, 2^20042430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20042430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25933824).

20042430 is an abundant number, since it is smaller than the sum of its proper divisors (31825218).

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

20042430 is a wasteful number, since it uses less digits than its factorization.

20042430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20042430 is about 4476.8772598766. The cubic root of 20042430 is about 271.6335806412.

Adding to 20042430 its reverse (3424002), we get a palindrome (23466432).

The spelling of 20042430 in words is "twenty million, forty-two thousand, four hundred thirty".