20723233 has 4 divisors (see below), whose sum is σ = 20837908. Its totient is φ = 20608560.

The previous prime is 20723231. The next prime is 20723239. The reversal of 20723233 is 33232702.

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 1292769 + 19430464 = 1137^2 + 4408^2 .

It is a cyclic number.

It is not a de Polignac number, because 20723233 - 2¹ = 20723231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20723231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57066 + ... + 57427.

It is an arithmetic number, because the mean of its divisors is an integer number (5209477).

Almost surely, 2^20723233 is an apocalyptic number.

It is an amenable number.

20723233 is a deficient number, since it is larger than the sum of its proper divisors (114675).

20723233 is a wasteful number, since it uses less digits than its factorization.

20723233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114674.

The product of its (nonzero) digits is 1512, while the sum is 22.

The square root of 20723233 is about 4552.2777815067. The cubic root of 20723233 is about 274.6750232779.

Adding to 20723233 its reverse (33232702), we get a palindrome (53955935).

The spelling of 20723233 in words is "twenty million, seven hundred twenty-three thousand, two hundred thirty-three".