20442253 has 8 divisors (see below), whose sum is σ = 22053528. Its totient is φ = 18836544.

The previous prime is 20442203. The next prime is 20442269. The reversal of 20442253 is 35224402.

It can be written as a sum of positive squares in 4 ways, for example, as 29929 + 20412324 = 173^2 + 4518^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20442253 - 2²¹ = 18345101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442203) 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, 9375 + ... + 11347.

It is an arithmetic number, because the mean of its divisors is an integer number (2756691).

Almost surely, 2^20442253 is an apocalyptic number.

It is an amenable number.

20442253 is a deficient number, since it is larger than the sum of its proper divisors (1611275).

20442253 is a wasteful number, since it uses less digits than its factorization.

20442253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20442253 is about 4521.3109824475. The cubic root of 20442253 is about 273.4279583479.

Adding to 20442253 its reverse (35224402), we get a palindrome (55666655).

The spelling of 20442253 in words is "twenty million, four hundred forty-two thousand, two hundred fifty-three".