20442305 has 8 divisors (see below), whose sum is σ = 26417832. Its totient is φ = 15095808.

The previous prime is 20442293. The next prime is 20442349. The reversal of 20442305 is 50324402.

It can be written as a sum of positive squares in 4 ways, for example, as 309136 + 20133169 = 556^2 + 4487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20442305 - 2¹⁸ = 20180161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157184 + ... + 157313.

It is an arithmetic number, because the mean of its divisors is an integer number (3302229).

Almost surely, 2^20442305 is an apocalyptic number.

It is an amenable number.

20442305 is a deficient number, since it is larger than the sum of its proper divisors (5975527).

20442305 is a wasteful number, since it uses less digits than its factorization.

20442305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314515.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20442305 is about 4521.3167329883. The cubic root of 20442305 is about 273.4281901919.

Adding to 20442305 its reverse (50324402), we get a palindrome (70766707).

The spelling of 20442305 in words is "twenty million, four hundred forty-two thousand, three hundred five".