2185573820 has 12 divisors (see below), whose sum is σ = 4589705064. Its totient is φ = 874229520.

The previous prime is 2185573813. The next prime is 2185573853. The reversal of 2185573820 is 283755812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54639326 + ... + 54639365.

It is an arithmetic number, because the mean of its divisors is an integer number (382475422).

Almost surely, 2^2185573820 is an apocalyptic number.

2185573820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2185573820 is an abundant number, since it is smaller than the sum of its proper divisors (2404131244).

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

2185573820 is a wasteful number, since it uses less digits than its factorization.

2185573820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109278700 (or 109278698 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 2185573820 is about 46750.1210693619. The cubic root of 2185573820 is about 1297.7423972590.

The spelling of 2185573820 in words is "two billion, one hundred eighty-five million, five hundred seventy-three thousand, eight hundred twenty".