2820023 has 4 divisors (see below), whose sum is σ = 2867880. Its totient is φ = 2772168.

The previous prime is 2820019. The next prime is 2820031. The reversal of 2820023 is 3200282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200282 = 2 ⋅1600141.

It is a cyclic number.

It is not a de Polignac number, because 2820023 - 2² = 2820019 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2819983 and 2820010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 23840 + ... + 23957.

It is an arithmetic number, because the mean of its divisors is an integer number (716970).

2^2820023 is an apocalyptic number.

2820023 is a deficient number, since it is larger than the sum of its proper divisors (47857).

2820023 is an equidigital number, since it uses as much as digits as its factorization.

2820023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47856.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2820023 is about 1679.2924105110. The cubic root of 2820023 is about 141.2811485330.

The spelling of 2820023 in words is "two million, eight hundred twenty thousand, twenty-three".