20001320 has 32 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 7829568.

The previous prime is 20001307. The next prime is 20001341. The reversal of 20001320 is 2310002.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 20001298 and 20001307.

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, 3440 + ... + 7199.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^20001320 is an apocalyptic number.

20001320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001320 is an abundant number, since it is smaller than the sum of its proper divisors (25963480).

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

20001320 is a wasteful number, since it uses less digits than its factorization.

20001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10697 (or 10693 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20001320 is about 4472.2835330511. The cubic root of 20001320 is about 271.4477332469.

Adding to 20001320 its reverse (2310002), we get a palindrome (22311322).

The spelling of 20001320 in words is "twenty million, one thousand, three hundred twenty".