20123353 has 4 divisors (see below), whose sum is σ = 20225700. Its totient is φ = 20021008.

The previous prime is 20123347. The next prime is 20123377. The reversal of 20123353 is 35332102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 8508889 = 3408^2 + 2917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123353.

It is not an unprimeable number, because it can be changed into a prime (20124353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50878 + ... + 51271.

It is an arithmetic number, because the mean of its divisors is an integer number (5056425).

Almost surely, 2^20123353 is an apocalyptic number.

It is an amenable number.

20123353 is a deficient number, since it is larger than the sum of its proper divisors (102347).

20123353 is a wasteful number, since it uses less digits than its factorization.

20123353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102346.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20123353 is about 4485.9060400325. The cubic root of 20123353 is about 271.9986708773.

Adding to 20123353 its reverse (35332102), we get a palindrome (55455455).

The spelling of 20123353 in words is "twenty million, one hundred twenty-three thousand, three hundred fifty-three".