20121313220 has 48 divisors (see below), whose sum is σ = 46183592448. Its totient is φ = 7330721280.

The previous prime is 20121313181. The next prime is 20121313297. The reversal of 20121313220 is 2231312102.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943982 + ... + 965061.

It is an arithmetic number, because the mean of its divisors is an integer number (962158176).

Almost surely, 2^20121313220 is an apocalyptic number.

20121313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121313220 is an abundant number, since it is smaller than the sum of its proper divisors (26062279228).

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

20121313220 is a wasteful number, since it uses less digits than its factorization.

20121313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909100 (or 1909098 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20121313220 its reverse (2231312102), we get a palindrome (22352625322).

The spelling of 20121313220 in words is "twenty billion, one hundred twenty-one million, three hundred thirteen thousand, two hundred twenty".