2820021605 has 8 divisors (see below), whose sum is σ = 3531157632. Its totient is φ = 2157929488.

The previous prime is 2820021599. The next prime is 2820021689. The reversal of 2820021605 is 5061200282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2820021605 - 2¹² = 2820017509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12260849 + ... + 12261078.

It is an arithmetic number, because the mean of its divisors is an integer number (441394704).

Almost surely, 2^2820021605 is an apocalyptic number.

It is an amenable number.

2820021605 is a deficient number, since it is larger than the sum of its proper divisors (711136027).

2820021605 is a wasteful number, since it uses less digits than its factorization.

2820021605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24521955.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2820021605 is about 53103.8756118609. The cubic root of 2820021605 is about 1412.8112523684.

Adding to 2820021605 its reverse (5061200282), we get a palindrome (7881221887).

The spelling of 2820021605 in words is "two billion, eight hundred twenty million, twenty-one thousand, six hundred five".