20130135320 has 16 divisors (see below), whose sum is σ = 45292804560. Its totient is φ = 8052054112.

The previous prime is 20130135239. The next prime is 20130135397. The reversal of 20130135320 is 2353103102.

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 = 20130135292 and 20130135301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251626652 + ... + 251626731.

It is an arithmetic number, because the mean of its divisors is an integer number (2830800285).

Almost surely, 2^20130135320 is an apocalyptic number.

20130135320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20130135320 is an abundant number, since it is smaller than the sum of its proper divisors (25162669240).

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

20130135320 is a wasteful number, since it uses less digits than its factorization.

20130135320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503253394 (or 503253390 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 20130135320 its reverse (2353103102), we get a palindrome (22483238422).

The spelling of 20130135320 in words is "twenty billion, one hundred thirty million, one hundred thirty-five thousand, three hundred twenty".