20022993 has 24 divisors (see below), whose sum is σ = 30567680. Its totient is φ = 12610080.

The previous prime is 20022971. The next prime is 20023001. The reversal of 20022993 is 39922002.

It is not a de Polignac number, because 20022993 - 2²¹ = 17925841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20022913) 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 23 ways as a sum of consecutive naturals, for example, 11163 + ... + 12831.

Almost surely, 2^20022993 is an apocalyptic number.

It is an amenable number.

20022993 is a deficient number, since it is larger than the sum of its proper divisors (10544687).

20022993 is a wasteful number, since it uses less digits than its factorization.

20022993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20022993 is about 4474.7059121243. The cubic root of 20022993 is about 271.5457428294.

Adding to 20022993 its reverse (39922002), we get a palindrome (59944995).

The spelling of 20022993 in words is "twenty million, twenty-two thousand, nine hundred ninety-three".