20442340 has 24 divisors (see below), whose sum is σ = 43013880. Its totient is φ = 8160768.

The previous prime is 20442293. The next prime is 20442349. The reversal of 20442340 is 4324402.

It can be written as a sum of positive squares in 4 ways, for example, as 443556 + 19998784 = 666^2 + 4472^2 .

It is not an unprimeable number, because it can be changed into a prime (20442349) 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, 19674 + ... + 20686.

It is an arithmetic number, because the mean of its divisors is an integer number (1792245).

Almost surely, 2^20442340 is an apocalyptic number.

20442340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20442340 is an abundant number, since it is smaller than the sum of its proper divisors (22571540).

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

20442340 is a wasteful number, since it uses less digits than its factorization.

20442340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031 (or 2029 counting only the distinct ones).

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

The square root of 20442340 is about 4521.3206035405. The cubic root of 20442340 is about 273.4283462405.

Adding to 20442340 its reverse (4324402), we get a palindrome (24766742).

The spelling of 20442340 in words is "twenty million, four hundred forty-two thousand, three hundred forty".