20438353 has 6 divisors (see below), whose sum is σ = 22131654. Its totient is φ = 18866016.

The previous prime is 20438311. The next prime is 20438371. The reversal of 20438353 is 35383402.

It can be written as a sum of positive squares in 3 ways, for example, as 1227664 + 19210689 = 1108^2 + 4383^2 .

It is not a de Polignac number, because 20438353 - 2¹⁷ = 20307281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60300 + ... + 60637.

It is an arithmetic number, because the mean of its divisors is an integer number (3688609).

Almost surely, 2^20438353 is an apocalyptic number.

It is an amenable number.

20438353 is a deficient number, since it is larger than the sum of its proper divisors (1693301).

20438353 is a wasteful number, since it uses less digits than its factorization.

20438353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120963 (or 120950 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20438353 is about 4520.8796710375. The cubic root of 20438353 is about 273.4105689264.

The spelling of 20438353 in words is "twenty million, four hundred thirty-eight thousand, three hundred fifty-three".