20130231220 has 48 divisors (see below), whose sum is σ = 46573180416. Its totient is φ = 7247600000.

The previous prime is 20130231217. The next prime is 20130231223. The reversal of 20130231220 is 2213203102.

It is an interprime number because it is at equal distance from previous prime (20130231217) and next prime (20130231223).

It is a junction number, because it is equal to n+sod(n) for n = 20130231194 and 20130231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130231223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430756 + ... + 475195.

It is an arithmetic number, because the mean of its divisors is an integer number (970274592).

Almost surely, 2^20130231220 is an apocalyptic number.

20130231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20130231220 is an abundant number, since it is smaller than the sum of its proper divisors (26442949196).

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

20130231220 is a wasteful number, since it uses less digits than its factorization.

20130231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906072 (or 906070 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20130231220 its reverse (2213203102), we get a palindrome (22343434322).

The spelling of 20130231220 in words is "twenty billion, one hundred thirty million, two hundred thirty-one thousand, two hundred twenty".