20023351 has 4 divisors (see below), whose sum is σ = 20221704. Its totient is φ = 19825000.

The previous prime is 20023343. The next prime is 20023379. The reversal of 20023351 is 15332002.

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 20023351 - 2³ = 20023343 is a prime.

It is a super-3 number, since 3×20023351³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023391) 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, 99025 + ... + 99226.

It is an arithmetic number, because the mean of its divisors is an integer number (5055426).

Almost surely, 2^20023351 is an apocalyptic number.

20023351 is a deficient number, since it is larger than the sum of its proper divisors (198353).

20023351 is a wasteful number, since it uses less digits than its factorization.

20023351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198352.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20023351 is about 4474.7459145744. The cubic root of 20023351 is about 271.5473611822.

Adding to 20023351 its reverse (15332002), we get a palindrome (35355353).

The spelling of 20023351 in words is "twenty million, twenty-three thousand, three hundred fifty-one".