1802166820 has 24 divisors (see below), whose sum is σ = 3797479224. Its totient is φ = 718404096.

The previous prime is 1802166781. The next prime is 1802166823. The reversal of 1802166820 is 286612081.

It can be written as a sum of positive squares in 4 ways, for example, as 368332864 + 1433833956 = 19192^2 + 37866^2 .

It is not an unprimeable number, because it can be changed into a prime (1802166823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147909 + ... + 159628.

It is an arithmetic number, because the mean of its divisors is an integer number (158228301).

Almost surely, 2^1802166820 is an apocalyptic number.

1802166820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1802166820 is an abundant number, since it is smaller than the sum of its proper divisors (1995312404).

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

1802166820 is a wasteful number, since it uses less digits than its factorization.

1802166820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307839 (or 307837 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1802166820 is about 42451.9354093544. The cubic root of 1802166820 is about 1216.9283158629.

The spelling of 1802166820 in words is "one billion, eight hundred two million, one hundred sixty-six thousand, eight hundred twenty".