20313320 has 32 divisors (see below), whose sum is σ = 45839520. Its totient is φ = 8101440.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313320 is 2331302.

It is a junction number, because it is equal to n+sod(n) for n = 20313295 and 20313304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20435 + ... + 21405.

It is an arithmetic number, because the mean of its divisors is an integer number (1432485).

Almost surely, 2^20313320 is an apocalyptic number.

20313320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20313320 is an abundant number, since it is smaller than the sum of its proper divisors (25526200).

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

20313320 is a wasteful number, since it uses less digits than its factorization.

20313320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20313320 is about 4507.0300642441. The cubic root of 20313320 is about 272.8518922735.

Adding to 20313320 its reverse (2331302), we get a palindrome (22644622).

The spelling of 20313320 in words is "twenty million, three hundred thirteen thousand, three hundred twenty".