2108920018 has 16 divisors (see below), whose sum is σ = 3273258240. Its totient is φ = 1017997200.

The previous prime is 2108920007. The next prime is 2108920019. The reversal of 2108920018 is 8100298012.

It is a happy number.

It is a super-2 number, since 2×2108920018² = 8895087284642240648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (2108920019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14613 + ... + 66568.

It is an arithmetic number, because the mean of its divisors is an integer number (204578640).

Almost surely, 2^2108920018 is an apocalyptic number.

2108920018 is a deficient number, since it is larger than the sum of its proper divisors (1164338222).

2108920018 is a wasteful number, since it uses less digits than its factorization.

2108920018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81633.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 2108920018 is about 45922.9791934278. The cubic root of 2108920018 is about 1282.3897449888.

The spelling of 2108920018 in words is "two billion, one hundred eight million, nine hundred twenty thousand, eighteen".