20312424 has 128 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 6022080.

The previous prime is 20312419. The next prime is 20312429. The reversal of 20312424 is 42421302.

It is an interprime number because it is at equal distance from previous prime (20312419) and next prime (20312429).

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

It is a junction number, because it is equal to n+sod(n) for n = 20312397 and 20312406.

It is not an unprimeable number, because it can be changed into a prime (20312429) 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 31 ways as a sum of consecutive naturals, for example, 197157 + ... + 197259.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^20312424 is an apocalyptic number.

20312424 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 20312424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31449600).

20312424 is an abundant number, since it is smaller than the sum of its proper divisors (42586776).

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

20312424 is a wasteful number, since it uses less digits than its factorization.

20312424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20312424 is about 4506.9306628791. The cubic root of 20312424 is about 272.8478804741.

Adding to 20312424 its reverse (42421302), we get a palindrome (62733726).

It can be divided in two parts, 20312 and 424, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20312424 in words is "twenty million, three hundred twelve thousand, four hundred twenty-four".