2091720 has 32 divisors (see below), whose sum is σ = 6275520. Its totient is φ = 557760.

The previous prime is 2091709. The next prime is 2091737. The reversal of 2091720 is 271902.

It is a happy number.

It is a nialpdrome in base 8.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 8596 + ... + 8835.

It is an arithmetic number, because the mean of its divisors is an integer number (196110).

2^2091720 is an apocalyptic number.

2091720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091720 is an abundant number, since it is smaller than the sum of its proper divisors (4183800).

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

2091720 is a wasteful number, since it uses less digits than its factorization.

2091720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17445 (or 17441 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 2091720 is about 1446.2779815789. The cubic root of 2091720 is about 127.8893901222.

The spelling of 2091720 in words is "two million, ninety-one thousand, seven hundred twenty".