2009110091820 has 48 divisors (see below), whose sum is σ = 6058239663840. Its totient is φ = 494550176256.

The previous prime is 2009110091789. The next prime is 2009110091953. The reversal of 2009110091820 is 281900119002.

It is a super-2 number, since 2×2009110091820² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287890305 + ... + 1287891864.

It is an arithmetic number, because the mean of its divisors is an integer number (126213326330).

Almost surely, 2^{2009110091820} is an apocalyptic number.

2009110091820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2009110091820 is an abundant number, since it is smaller than the sum of its proper divisors (4049129572020).

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

2009110091820 is a wasteful number, since it uses less digits than its factorization.

2009110091820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575782194 (or 2575782192 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 2009110091820 in words is "two trillion, nine billion, one hundred ten million, ninety-one thousand, eight hundred twenty".