2105666620 has 24 divisors (see below), whose sum is σ = 4487901264. Its totient is φ = 829694976.

The previous prime is 2105666617. The next prime is 2105666623. The reversal of 2105666620 is 266665012.

It is an interprime number because it is at equal distance from previous prime (2105666617) and next prime (2105666623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105666623) 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, 784357 + ... + 787036.

It is an arithmetic number, because the mean of its divisors is an integer number (186995886).

Almost surely, 2^2105666620 is an apocalyptic number.

2105666620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105666620 is an abundant number, since it is smaller than the sum of its proper divisors (2382234644).

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

2105666620 is a wasteful number, since it uses less digits than its factorization.

2105666620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571469 (or 1571467 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 2105666620 is about 45887.5431898462. The cubic root of 2105666620 is about 1281.7299647126.

The spelling of 2105666620 in words is "two billion, one hundred five million, six hundred sixty-six thousand, six hundred twenty".