13420321220 has 24 divisors (see below), whose sum is σ = 29840479704. Its totient is φ = 5052356096.

The previous prime is 13420321183. The next prime is 13420321247. The reversal of 13420321220 is 2212302431.

It can be written as a sum of positive squares in 4 ways, for example, as 850772224 + 12569548996 = 29168^2 + 112114^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13420321192 and 13420321201.

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, 19735427 + ... + 19736106.

It is an arithmetic number, because the mean of its divisors is an integer number (1243353321).

Almost surely, 2^13420321220 is an apocalyptic number.

13420321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13420321220 is an abundant number, since it is smaller than the sum of its proper divisors (16420158484).

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

13420321220 is a wasteful number, since it uses less digits than its factorization.

13420321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39471559 (or 39471557 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 13420321220 its reverse (2212302431), we get a palindrome (15632623651).

The spelling of 13420321220 in words is "thirteen billion, four hundred twenty million, three hundred twenty-one thousand, two hundred twenty".