2087820 has 72 divisors (see below), whose sum is σ = 7242144. Its totient is φ = 476928.

The previous prime is 2087809. The next prime is 2087831. The reversal of 2087820 is 287802.

2087820 = T₁₀₄ + T₁₀₅ + ... + T₂₃₈.

It is an interprime number because it is at equal distance from previous prime (2087809) and next prime (2087831).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432 + ... + 2088.

2^2087820 is an apocalyptic number.

2087820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2087820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3621072).

2087820 is an abundant number, since it is smaller than the sum of its proper divisors (5154324).

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

2087820 is a wasteful number, since it uses less digits than its factorization.

2087820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 2087820 is about 1444.9290640028. The cubic root of 2087820 is about 127.8098576598.

The spelling of 2087820 in words is "two million, eighty-seven thousand, eight hundred twenty".