20311130502 has 96 divisors (see below), whose sum is σ = 48100512096. Its totient is φ = 6156864000.

The previous prime is 20311130431. The next prime is 20311130503. The reversal of 20311130502 is 20503111302.

20311130502 is a `hidden beast` number, since 2 + 0 + 31 + 1 + 130 + 502 = 666.

20311130502 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311130503) 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, 4984738 + ... + 4988810.

It is an arithmetic number, because the mean of its divisors is an integer number (501047001).

Almost surely, 2^20311130502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20311130502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24050256048).

20311130502 is an abundant number, since it is smaller than the sum of its proper divisors (27789381594).

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

20311130502 is a wasteful number, since it uses less digits than its factorization.

20311130502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406 (or 4403 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 20311130502 its reverse (20503111302), we get a palindrome (40814241804).

The spelling of 20311130502 in words is "twenty billion, three hundred eleven million, one hundred thirty thousand, five hundred two".