20130302556 has 144 divisors (see below), whose sum is σ = 64787486400. Its totient is φ = 5125994496.

The previous prime is 20130302551. The next prime is 20130302557. The reversal of 20130302556 is 65520303102.

It is a super-2 number, since 2×20130302556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130302551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10941 + ... + 200948.

It is an arithmetic number, because the mean of its divisors is an integer number (449913100).

Almost surely, 2^20130302556 is an apocalyptic number.

20130302556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20130302556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32393743200).

20130302556 is an abundant number, since it is smaller than the sum of its proper divisors (44657183844).

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

20130302556 is a wasteful number, since it uses less digits than its factorization.

20130302556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211948 (or 211943 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 20130302556 its reverse (65520303102), we get a palindrome (85650605658).

The spelling of 20130302556 in words is "twenty billion, one hundred thirty million, three hundred two thousand, five hundred fifty-six".