20343312 has 100 divisors (see below), whose sum is σ = 64277136. Its totient is φ = 6160320.

The previous prime is 20343287. The next prime is 20343329. The reversal of 20343312 is 21334302.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13543 + ... + 14969.

Almost surely, 2^20343312 is an apocalyptic number.

20343312 is a gapful number since it is divisible by the number (22) 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 20343312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32138568).

20343312 is an abundant number, since it is smaller than the sum of its proper divisors (43933824).

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

20343312 is a wasteful number, since it uses less digits than its factorization.

20343312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20343312 is about 4510.3560835038. The cubic root of 20343312 is about 272.9861120818.

Adding to 20343312 its reverse (21334302), we get a palindrome (41677614).

The spelling of 20343312 in words is "twenty million, three hundred forty-three thousand, three hundred twelve".