20628323 has 4 divisors (see below), whose sum is σ = 20647368. Its totient is φ = 20609280.

The previous prime is 20628317. The next prime is 20628337. The reversal of 20628323 is 32382602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20628323 - 2¹⁸ = 20366179 is a prime.

It is a super-3 number, since 3×20628323³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20628292 and 20628301.

It is not an unprimeable number, because it can be changed into a prime (20628313) 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, 7793 + ... + 10098.

It is an arithmetic number, because the mean of its divisors is an integer number (5161842).

Almost surely, 2^20628323 is an apocalyptic number.

20628323 is a deficient number, since it is larger than the sum of its proper divisors (19045).

20628323 is a wasteful number, since it uses less digits than its factorization.

20628323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19044.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20628323 is about 4541.8413666706. The cubic root of 20628323 is about 274.2550549214.

The spelling of 20628323 in words is "twenty million, six hundred twenty-eight thousand, three hundred twenty-three".