20438233 has 8 divisors (see below), whose sum is σ = 21996360. Its totient is φ = 18919680.

The previous prime is 20438221. The next prime is 20438251. The reversal of 20438233 is 33283402.

It can be written as a sum of positive squares in 4 ways, for example, as 1192464 + 19245769 = 1092^2 + 4387^2 .

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 20438233 - 2¹³ = 20430041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20438198 and 20438207.

It is not an unprimeable number, because it can be changed into a prime (20438203) 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, 8818 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (2749545).

Almost surely, 2^20438233 is an apocalyptic number.

It is an amenable number.

20438233 is a deficient number, since it is larger than the sum of its proper divisors (1558127).

20438233 is a wasteful number, since it uses less digits than its factorization.

20438233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19787.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20438233 is about 4520.8663992646. The cubic root of 20438233 is about 273.4100338322.

The spelling of 20438233 in words is "twenty million, four hundred thirty-eight thousand, two hundred thirty-three".