20123533 has 8 divisors (see below), whose sum is σ = 20360088. Its totient is φ = 19888704.

The previous prime is 20123513. The next prime is 20123539. The reversal of 20123533 is 33532102.

It can be written as a sum of positive squares in 4 ways, for example, as 14160169 + 5963364 = 3763^2 + 2442^2 .

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 20123533 - 2⁹ = 20123021 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 20123533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123539) 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 7 ways as a sum of consecutive naturals, for example, 50491 + ... + 50887.

It is an arithmetic number, because the mean of its divisors is an integer number (2545011).

Almost surely, 2^20123533 is an apocalyptic number.

It is an amenable number.

20123533 is a deficient number, since it is larger than the sum of its proper divisors (236555).

20123533 is a wasteful number, since it uses less digits than its factorization.

20123533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

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

The square root of 20123533 is about 4485.9261028243. The cubic root of 20123533 is about 271.9994818690. Note that the first 3 decimals are identical.

Adding to 20123533 its reverse (33532102), we get a palindrome (53655635).

The spelling of 20123533 in words is "twenty million, one hundred twenty-three thousand, five hundred thirty-three".