20013320 has 16 divisors (see below), whose sum is σ = 45030060. Its totient is φ = 8005312.

The previous prime is 20013319. The next prime is 20013347. The reversal of 20013320 is 2331002.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 1643524 = 4286^2 + 1282^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250127 + ... + 250206.

Almost surely, 2^20013320 is an apocalyptic number.

20013320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013320 is an abundant number, since it is smaller than the sum of its proper divisors (25016740).

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

20013320 is a wasteful number, since it uses less digits than its factorization.

20013320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500344 (or 500340 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20013320 is about 4473.6249283998. The cubic root of 20013320 is about 271.5020083578.

Adding to 20013320 its reverse (2331002), we get a palindrome (22344322).

The spelling of 20013320 in words is "twenty million, thirteen thousand, three hundred twenty".