20131210220 has 48 divisors (see below), whose sum is σ = 48546086400. Its totient is φ = 6935152320.

The previous prime is 20131210217. The next prime is 20131210243. The reversal of 20131210220 is 2201213102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20131210195 and 20131210204.

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, 2403860 + ... + 2412219.

It is an arithmetic number, because the mean of its divisors is an integer number (1011376800).

Almost surely, 2^20131210220 is an apocalyptic number.

20131210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131210220 is an abundant number, since it is smaller than the sum of its proper divisors (28414876180).

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

20131210220 is a wasteful number, since it uses less digits than its factorization.

20131210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816118 (or 4816116 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20131210220 its reverse (2201213102), we get a palindrome (22332423322).

The spelling of 20131210220 in words is "twenty billion, one hundred thirty-one million, two hundred ten thousand, two hundred twenty".