16505420 has 24 divisors (see below), whose sum is σ = 35008848. Its totient is φ = 6536000.

The previous prime is 16505417. The next prime is 16505431. The reversal of 16505420 is 2450561.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2066 + ... + 6105.

It is an arithmetic number, because the mean of its divisors is an integer number (1458702).

Almost surely, 2^16505420 is an apocalyptic number.

16505420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16505420 is an abundant number, since it is smaller than the sum of its proper divisors (18503428).

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

16505420 is a wasteful number, since it uses less digits than its factorization.

16505420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8281 (or 8279 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 16505420 is about 4062.6863034204. The cubic root of 16505420 is about 254.6100408930.

Adding to 16505420 its reverse (2450561), we get a palindrome (18955981).

The spelling of 16505420 in words is "sixteen million, five hundred five thousand, four hundred twenty".