16309820 has 12 divisors (see below), whose sum is σ = 34250664. Its totient is φ = 6523920.

The previous prime is 16309819. The next prime is 16309823. The reversal of 16309820 is 2890361.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16309823) 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, 407726 + ... + 407765.

It is an arithmetic number, because the mean of its divisors is an integer number (2854222).

Almost surely, 2^16309820 is an apocalyptic number.

16309820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16309820 is an abundant number, since it is smaller than the sum of its proper divisors (17940844).

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

16309820 is a wasteful number, since it uses less digits than its factorization.

16309820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815500 (or 815498 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16309820 is about 4038.5418160519. The cubic root of 16309820 is about 253.6002764810.

The spelling of 16309820 in words is "sixteen million, three hundred nine thousand, eight hundred twenty".