20312420 has 24 divisors (see below), whose sum is σ = 42747264. Its totient is φ = 8107616.

The previous prime is 20312419. The next prime is 20312429. The reversal of 20312420 is 2421302.

It is a junction number, because it is equal to n+sod(n) for n = 20312395 and 20312404.

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 7 ways as a sum of consecutive naturals, for example, 12917 + ... + 14403.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136).

Almost surely, 2^20312420 is an apocalyptic number.

20312420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312420 is an abundant number, since it is smaller than the sum of its proper divisors (22434844).

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

20312420 is a wasteful number, since it uses less digits than its factorization.

20312420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179 (or 2177 counting only the distinct ones).

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

The square root of 20312420 is about 4506.9302191181. The cubic root of 20312420 is about 272.8478625641.

Adding to 20312420 its reverse (2421302), we get a palindrome (22733722).

The spelling of 20312420 in words is "twenty million, three hundred twelve thousand, four hundred twenty".