16405620 has 192 divisors, whose sum is σ = 59222016. Its totient is φ = 3294720.

The previous prime is 16405591. The next prime is 16405621. The reversal of 16405620 is 2650461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405621) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 244827 + ... + 244893.

It is an arithmetic number, because the mean of its divisors is an integer number (308448).

Almost surely, 2^16405620 is an apocalyptic number.

16405620 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 16405620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29611008).

16405620 is an abundant number, since it is smaller than the sum of its proper divisors (42816396).

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

16405620 is a wasteful number, since it uses less digits than its factorization.

16405620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 16405620 is about 4050.3851668699. The cubic root of 16405620 is about 254.0958366937.

It can be divided in two parts, 1640 and 5620, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 16405620 in words is "sixteen million, four hundred five thousand, six hundred twenty".