20242290 has 64 divisors (see below), whose sum is σ = 51321600. Its totient is φ = 5101824.

The previous prime is 20242273. The next prime is 20242297. The reversal of 20242290 is 9224202.

It is not an unprimeable number, because it can be changed into a prime (20242297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45891 + ... + 46329.

It is an arithmetic number, because the mean of its divisors is an integer number (801900).

Almost surely, 2^20242290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20242290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25660800).

20242290 is an abundant number, since it is smaller than the sum of its proper divisors (31079310).

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

20242290 is a wasteful number, since it uses less digits than its factorization.

20242290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20242290 is about 4499.1432517758. The cubic root of 20242290 is about 272.5334919416.

Adding to 20242290 its reverse (9224202), we get a palindrome (29466492).

The spelling of 20242290 in words is "twenty million, two hundred forty-two thousand, two hundred ninety".