20311104 has 112 divisors (see below), whose sum is σ = 59984640. Its totient is φ = 6013440.

The previous prime is 20311103. The next prime is 20311111. The reversal of 20311104 is 40111302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20311104.

It is not an unprimeable number, because it can be changed into a prime (20311103) 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 15 ways as a sum of consecutive naturals, for example, 124527 + ... + 124689.

Almost surely, 2^20311104 is an apocalyptic number.

20311104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20311104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29992320).

20311104 is an abundant number, since it is smaller than the sum of its proper divisors (39673536).

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

20311104 is a wasteful number, since it uses less digits than its factorization.

20311104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20311104 is about 4506.7842193742. The cubic root of 20311104 is about 272.8419700191.

Adding to 20311104 its reverse (40111302), we get a palindrome (60422406).

The spelling of 20311104 in words is "twenty million, three hundred eleven thousand, one hundred four".