1820220043 has 2 divisors, whose sum is σ = 1820220044. Its totient is φ = 1820220042.

The previous prime is 1820220037. The next prime is 1820220169. The reversal of 1820220043 is 3400220281.

It is a weak prime.

It is an emirp because it is prime and its reverse (3400220281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820220043 - 2¹⁷ = 1820088971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1820219996 and 1820220023.

It is not a weakly prime, because it can be changed into another prime (1820220013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910110021 + 910110022.

It is an arithmetic number, because the mean of its divisors is an integer number (910110022).

Almost surely, 2^1820220043 is an apocalyptic number.

1820220043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820220043 is an equidigital number, since it uses as much as digits as its factorization.

1820220043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1820220043 is about 42664.0368811954. The cubic root of 1820220043 is about 1220.9783523267.

The spelling of 1820220043 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, forty-three".