20130516 has 144 divisors (see below), whose sum is σ = 63737856. Its totient is φ = 5225472.

The previous prime is 20130503. The next prime is 20130521. The reversal of 20130516 is 61503102.

20130516 is a `hidden beast` number, since 20 + 130 + 516 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158445 + ... + 158571.

It is an arithmetic number, because the mean of its divisors is an integer number (442624).

Almost surely, 2^20130516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20130516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31868928).

20130516 is an abundant number, since it is smaller than the sum of its proper divisors (43607340).

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

20130516 is a wasteful number, since it uses less digits than its factorization.

20130516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 193 counting only the distinct ones).

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

The square root of 20130516 is about 4486.7043584350. The cubic root of 20130516 is about 272.0309401079.

Adding to 20130516 its reverse (61503102), we get a palindrome (81633618).

The spelling of 20130516 in words is "twenty million, one hundred thirty thousand, five hundred sixteen".