20681822 has 12 divisors (see below), whose sum is σ = 36087840. Its totient is φ = 8863596.

The previous prime is 20681821. The next prime is 20681831. The reversal of 20681822 is 22818602.

It is a super-2 number, since 2×20681822² = 855475522479368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105422 + ... + 105617.

It is an arithmetic number, because the mean of its divisors is an integer number (3007320).

Almost surely, 2^20681822 is an apocalyptic number.

20681822 is a deficient number, since it is larger than the sum of its proper divisors (15406018).

20681822 is a wasteful number, since it uses less digits than its factorization.

20681822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211055 (or 211048 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20681822 is about 4547.7271246195. The cubic root of 20681822 is about 274.4919412854.

It can be divided in two parts, 206 and 81822, that added together give a palindrome (82028).

The spelling of 20681822 in words is "twenty million, six hundred eighty-one thousand, eight hundred twenty-two".