2809001020 has 96 divisors (see below), whose sum is σ = 6939434880. Its totient is φ = 935055360.

The previous prime is 2809001003. The next prime is 2809001029. The reversal of 2809001020 is 201009082.

It is a super-2 number, since 2×2809001020² = 15780973460722080800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2809000982 and 2809001000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809001029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1313392 + ... + 1315528.

It is an arithmetic number, because the mean of its divisors is an integer number (72285780).

Almost surely, 2^2809001020 is an apocalyptic number.

2809001020 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 2809001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3469717440).

2809001020 is an abundant number, since it is smaller than the sum of its proper divisors (4130433860).

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

2809001020 is a wasteful number, since it uses less digits than its factorization.

2809001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2421 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2809001020 is about 53000.0096226406. The cubic root of 2809001020 is about 1410.9684375193.

The spelling of 2809001020 in words is "two billion, eight hundred nine million, one thousand, twenty".