1820220041 has 4 divisors (see below), whose sum is σ = 1820767872. Its totient is φ = 1819672212.

The previous prime is 1820220037. The next prime is 1820220043. The reversal of 1820220041 is 1400220281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1820220041 - 2² = 1820220037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1820219995 and 1820220022.

It is not an unprimeable number, because it can be changed into a prime (1820220043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268901 + ... + 275586.

It is an arithmetic number, because the mean of its divisors is an integer number (455191968).

Almost surely, 2^1820220041 is an apocalyptic number.

It is an amenable number.

1820220041 is a deficient number, since it is larger than the sum of its proper divisors (547831).

1820220041 is an equidigital number, since it uses as much as digits as its factorization.

1820220041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547830.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1820220041 is about 42664.0368577564. The cubic root of 1820220041 is about 1220.9783518795.

The spelling of 1820220041 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, forty-one".