20442330 has 96 divisors (see below), whose sum is σ = 58226688. Its totient is φ = 4953600.

The previous prime is 20442293. The next prime is 20442349. The reversal of 20442330 is 3324402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47215 + ... + 47645.

It is an arithmetic number, because the mean of its divisors is an integer number (606528).

Almost surely, 2^20442330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20442330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29113344).

20442330 is an abundant number, since it is smaller than the sum of its proper divisors (37784358).

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

20442330 is a wasteful number, since it uses less digits than its factorization.

20442330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20442330 is about 4521.3194976688. The cubic root of 20442330 is about 273.4283016552.

Adding to 20442330 its reverse (3324402), we get a palindrome (23766732).

The spelling of 20442330 in words is "twenty million, four hundred forty-two thousand, three hundred thirty".