20303131530 has 128 divisors (see below), whose sum is σ = 57320524800. Its totient is φ = 4549132800.

The previous prime is 20303131463. The next prime is 20303131579. The reversal of 20303131530 is 3513130302.

It is a junction number, because it is equal to n+sod(n) for n = 20303131497 and 20303131506.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 217581 + ... + 296559.

It is an arithmetic number, because the mean of its divisors is an integer number (447816600).

Almost surely, 2^20303131530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20303131530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28660262400).

20303131530 is an abundant number, since it is smaller than the sum of its proper divisors (37017393270).

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

20303131530 is a wasteful number, since it uses less digits than its factorization.

20303131530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79060.

The product of its (nonzero) digits is 810, while the sum is 21.

Adding to 20303131530 its reverse (3513130302), we get a palindrome (23816261832).

The spelling of 20303131530 in words is "twenty billion, three hundred three million, one hundred thirty-one thousand, five hundred thirty".