20833491 has 16 divisors (see below), whose sum is σ = 31812608. Its totient is φ = 11880000.

The previous prime is 20833487. The next prime is 20833493. The reversal of 20833491 is 19433802.

It is not a de Polignac number, because 20833491 - 2² = 20833487 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20833493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15111 + ... + 16431.

It is an arithmetic number, because the mean of its divisors is an integer number (1988288).

Almost surely, 2^20833491 is an apocalyptic number.

20833491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20833491 is a deficient number, since it is larger than the sum of its proper divisors (10979117).

20833491 is a wasteful number, since it uses less digits than its factorization.

20833491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20833491 is about 4564.3719173617. The cubic root of 20833491 is about 275.1612982113.

The spelling of 20833491 in words is "twenty million, eight hundred thirty-three thousand, four hundred ninety-one".