16620804 has 18 divisors (see below), whose sum is σ = 42013790. Its totient is φ = 5540256.

The previous prime is 16620787. The next prime is 16620827. The reversal of 16620804 is 40802661.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 5531904 = 3330^2 + 2352^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×16620804² = 552502251212832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 230809 + ... + 230880.

Almost surely, 2^16620804 is an apocalyptic number.

It is an amenable number.

16620804 is an abundant number, since it is smaller than the sum of its proper divisors (25392986).

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

16620804 is a wasteful number, since it uses less digits than its factorization.

16620804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461699 (or 461694 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 16620804 is about 4076.8620285705. The cubic root of 16620804 is about 255.2019622625.

It can be divided in two parts, 16620 and 804, that added together give a square (17424 = 132²).

The spelling of 16620804 in words is "sixteen million, six hundred twenty thousand, eight hundred four".