20681922 has 32 divisors (see below), whose sum is σ = 43774848. Its totient is φ = 6500736.

The previous prime is 20681893. The next prime is 20681933. The reversal of 20681922 is 22918602.

It is a super-2 number, since 2×20681922² = 855483795228168, which contains 22 as substring.

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 self number, because there is not a number n which added to its sum of digits gives 20681922.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9048 + ... + 11100.

It is an arithmetic number, because the mean of its divisors is an integer number (1367964).

Almost surely, 2^20681922 is an apocalyptic number.

20681922 is an abundant number, since it is smaller than the sum of its proper divisors (23092926).

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

20681922 is a wasteful number, since it uses less digits than its factorization.

20681922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20681922 is about 4547.7381191093. The cubic root of 20681922 is about 274.4923836892.

It can be divided in two parts, 206 and 81922, that added together give a palindrome (82128).

The spelling of 20681922 in words is "twenty million, six hundred eighty-one thousand, nine hundred twenty-two".