20183816 has 8 divisors (see below), whose sum is σ = 37844670. Its totient is φ = 10091904.

The previous prime is 20183783. The next prime is 20183819. The reversal of 20183816 is 61838102.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 23716 = 4490^2 + 154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20183819) 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 as a sum of consecutive naturals, namely, 1261481 + ... + 1261496.

Almost surely, 2^20183816 is an apocalyptic number.

It is an amenable number.

20183816 is a deficient number, since it is larger than the sum of its proper divisors (17660854).

20183816 is a wasteful number, since it uses less digits than its factorization.

20183816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522983 (or 2522979 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20183816 is about 4492.6402037110. The cubic root of 20183816 is about 272.2708159137.

The spelling of 20183816 in words is "twenty million, one hundred eighty-three thousand, eight hundred sixteen".