20833993 has 4 divisors (see below), whose sum is σ = 22059540. Its totient is φ = 19608448.

The previous prime is 20833991. The next prime is 20833999. The reversal of 20833993 is 39933802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39933802 = 2 ⋅19966901.

It can be written as a sum of positive squares in 2 ways, for example, as 10517049 + 10316944 = 3243^2 + 3212^2 .

It is a cyclic number.

It is not a de Polignac number, because 20833993 - 2¹ = 20833991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20833991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612748 + ... + 612781.

It is an arithmetic number, because the mean of its divisors is an integer number (5514885).

Almost surely, 2^20833993 is an apocalyptic number.

It is an amenable number.

20833993 is a deficient number, since it is larger than the sum of its proper divisors (1225547).

20833993 is a wasteful number, since it uses less digits than its factorization.

20833993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225546.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 20833993 is about 4564.4269081671. The cubic root of 20833993 is about 275.1635082724.

The spelling of 20833993 in words is "twenty million, eight hundred thirty-three thousand, nine hundred ninety-three".