20413312 has 32 divisors (see below), whose sum is σ = 41095800. Its totient is φ = 10099200.

The previous prime is 20413291. The next prime is 20413331. The reversal of 20413312 is 21331402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12139 + ... + 13717.

Almost surely, 2^20413312 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 20413312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20547900).

20413312 is an abundant number, since it is smaller than the sum of its proper divisors (20682488).

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

20413312 is a wasteful number, since it uses less digits than its factorization.

20413312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20413312 is about 4518.1093390931. The cubic root of 20413312 is about 273.2988627295.

Adding to 20413312 its reverse (21331402), we get a palindrome (41744714).

The spelling of 20413312 in words is "twenty million, four hundred thirteen thousand, three hundred twelve".