20984091 has 8 divisors (see below), whose sum is σ = 28240704. Its totient is φ = 13858440.

The previous prime is 20984071. The next prime is 20984123. The reversal of 20984091 is 19048902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20984091 - 2¹⁴ = 20967707 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20984021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32365 + ... + 33006.

It is an arithmetic number, because the mean of its divisors is an integer number (3530088).

Almost surely, 2^20984091 is an apocalyptic number.

20984091 is a deficient number, since it is larger than the sum of its proper divisors (7256613).

20984091 is a wasteful number, since it uses less digits than its factorization.

20984091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65481.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20984091 is about 4580.8395518726. The cubic root of 20984091 is about 275.8227306332.

The spelling of 20984091 in words is "twenty million, nine hundred eighty-four thousand, ninety-one".