20408112 has 120 divisors (see below), whose sum is σ = 61610640. Its totient is φ = 6531840.

The previous prime is 20408081. The next prime is 20408117. The reversal of 20408112 is 21180402.

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

It is not an unprimeable number, because it can be changed into a prime (20408117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112662 + ... + 112842.

It is an arithmetic number, because the mean of its divisors is an integer number (513422).

Almost surely, 2^20408112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20408112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30805320).

20408112 is an abundant number, since it is smaller than the sum of its proper divisors (41202528).

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

20408112 is a wasteful number, since it uses less digits than its factorization.

20408112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20408112 is about 4517.5338404931. The cubic root of 20408112 is about 273.2756544300.

Adding to 20408112 its reverse (21180402), we get a palindrome (41588514).

The spelling of 20408112 in words is "twenty million, four hundred eight thousand, one hundred twelve".