16516420 has 12 divisors (see below), whose sum is σ = 34684524. Its totient is φ = 6606560.

The previous prime is 16516417. The next prime is 16516427. The reversal of 16516420 is 2461561.

It can be written as a sum of positive squares in 2 ways, for example, as 5875776 + 10640644 = 2424^2 + 3262^2 .

It is not an unprimeable number, because it can be changed into a prime (16516427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412891 + ... + 412930.

It is an arithmetic number, because the mean of its divisors is an integer number (2890377).

Almost surely, 2^16516420 is an apocalyptic number.

16516420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16516420 is an abundant number, since it is smaller than the sum of its proper divisors (18168104).

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

16516420 is a wasteful number, since it uses less digits than its factorization.

16516420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825830 (or 825828 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16516420 is about 4064.0398620092. The cubic root of 16516420 is about 254.6665897621. Note that the first 3 decimals are identical.

Adding to 16516420 its reverse (2461561), we get a palindrome (18977981).

The spelling of 16516420 in words is "sixteen million, five hundred sixteen thousand, four hundred twenty".