20993082 has 16 divisors (see below), whose sum is σ = 45803232. Its totient is φ = 6361520.

The previous prime is 20993059. The next prime is 20993083. The reversal of 20993082 is 28039902.

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 a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20993083) 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, 158973 + ... + 159104.

It is an arithmetic number, because the mean of its divisors is an integer number (2862702).

Almost surely, 2^20993082 is an apocalyptic number.

20993082 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20993082 is an abundant number, since it is smaller than the sum of its proper divisors (24810150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20993082 is a wasteful number, since it uses less digits than its factorization.

20993082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318093.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20993082 is about 4581.8208170988. The cubic root of 20993082 is about 275.8621186958.

It can be divided in two parts, 209930 and 82, that added together give a palindrome (210012).

The spelling of 20993082 in words is "twenty million, nine hundred ninety-three thousand, eighty-two".