20101122 has 40 divisors (see below), whose sum is σ = 45372096. Its totient is φ = 6651288.

The previous prime is 20101099. The next prime is 20101129. The reversal of 20101122 is 22110102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20101129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26683 + ... + 27425.

Almost surely, 2^20101122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22686048).

20101122 is an abundant number, since it is smaller than the sum of its proper divisors (25270974).

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

20101122 is a wasteful number, since it uses less digits than its factorization.

20101122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20101122 is about 4483.4274835220. The cubic root of 20101122 is about 271.8984716953.

Adding to 20101122 its reverse (22110102), we get a palindrome (42211224).

The spelling of 20101122 in words is "twenty million, one hundred one thousand, one hundred twenty-two".