16520634 has 48 divisors (see below), whose sum is σ = 40825512. Its totient is φ = 4783104.

The previous prime is 16520629. The next prime is 16520653. The reversal of 16520634 is 43602561.

16520634 is a `hidden beast` number, since 1 + 6 + 5 + 20 + 634 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8381025 + 8139609 = 2895^2 + 2853^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16520598 and 16520607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1902 + ... + 6054.

Almost surely, 2^16520634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16520634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20412756).

16520634 is an abundant number, since it is smaller than the sum of its proper divisors (24304878).

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

16520634 is a wasteful number, since it uses less digits than its factorization.

16520634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191 (or 4188 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 16520634 is about 4064.5582785833. The cubic root of 16520634 is about 254.6882464680.

The spelling of 16520634 in words is "sixteen million, five hundred twenty thousand, six hundred thirty-four".