20402312 has 64 divisors (see below), whose sum is σ = 47952000. Its totient is φ = 7934976.

The previous prime is 20402287. The next prime is 20402321. The reversal of 20402312 is 21320402.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27239 + ... + 27977.

It is an arithmetic number, because the mean of its divisors is an integer number (749250).

Almost surely, 2^20402312 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 20402312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23976000).

20402312 is an abundant number, since it is smaller than the sum of its proper divisors (27549688).

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

20402312 is a wasteful number, since it uses less digits than its factorization.

20402312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20402312 is about 4516.8918517051. The cubic root of 20402312 is about 273.2497635984.

Adding to 20402312 its reverse (21320402), we get a palindrome (41722714).

The spelling of 20402312 in words is "twenty million, four hundred two thousand, three hundred twelve".