16520040 has 96 divisors (see below), whose sum is σ = 54311400. Its totient is φ = 4354560.

The previous prime is 16520027. The next prime is 16520099. The reversal of 16520040 is 4002561.

It is a happy number.

16520040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9326916 + 7193124 = 3054^2 + 2682^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16519995 and 16520022.

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, 39030 + ... + 39450.

Almost surely, 2^16520040 is an apocalyptic number.

16520040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16520040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27155700).

16520040 is an abundant number, since it is smaller than the sum of its proper divisors (37791360).

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

16520040 is a wasteful number, since it uses less digits than its factorization.

16520040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 16520040 is about 4064.4852072556. The cubic root of 16520040 is about 254.6851939897.

The spelling of 16520040 in words is "sixteen million, five hundred twenty thousand, forty".