20911122 has 48 divisors (see below), whose sum is σ = 49768992. Its totient is φ = 6557760.

The previous prime is 20911087. The next prime is 20911123. The reversal of 20911122 is 22111902.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20911095 and 20911104.

It is not an unprimeable number, because it can be changed into a prime (20911123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6997 + ... + 9527.

It is an arithmetic number, because the mean of its divisors is an integer number (1036854).

Almost surely, 2^20911122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20911122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24884496).

20911122 is an abundant number, since it is smaller than the sum of its proper divisors (28857870).

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

20911122 is a wasteful number, since it uses less digits than its factorization.

20911122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565 (or 2553 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 20911122 is about 4572.8680278355. The cubic root of 20911122 is about 275.5026487361.

The spelling of 20911122 in words is "twenty million, nine hundred eleven thousand, one hundred twenty-two".