20516130 has 96 divisors (see below), whose sum is σ = 56233008. Its totient is φ = 5184000.

The previous prime is 20516123. The next prime is 20516147. The reversal of 20516130 is 3161502.

20516130 is a `hidden beast` number, since 2 + 0 + 51 + 613 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 13242321 + 7273809 = 3639^2 + 2697^2 .

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

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, 203080 + ... + 203180.

Almost surely, 2^20516130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20516130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28116504).

20516130 is an abundant number, since it is smaller than the sum of its proper divisors (35716878).

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

20516130 is a wasteful number, since it uses less digits than its factorization.

20516130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 209 counting only the distinct ones).

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

The square root of 20516130 is about 4529.4734793351. The cubic root of 20516130 is about 273.7569460926.

Adding to 20516130 its reverse (3161502), we get a palindrome (23677632).

The spelling of 20516130 in words is "twenty million, five hundred sixteen thousand, one hundred thirty".