1820794820 has 24 divisors (see below), whose sum is σ = 4117798104. Its totient is φ = 672293376.

The previous prime is 1820794813. The next prime is 1820794823. The reversal of 1820794820 is 284970281.

It can be written as a sum of positive squares in 4 ways, for example, as 384081604 + 1436713216 = 19598^2 + 37904^2 .

It is not an unprimeable number, because it can be changed into a prime (1820794823) 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, 3501269 + ... + 3501788.

It is an arithmetic number, because the mean of its divisors is an integer number (171574921).

Almost surely, 2^1820794820 is an apocalyptic number.

1820794820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820794820 is an abundant number, since it is smaller than the sum of its proper divisors (2297003284).

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

1820794820 is a wasteful number, since it uses less digits than its factorization.

1820794820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003079 (or 7003077 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 1820794820 is about 42670.7724326617. The cubic root of 1820794820 is about 1221.1068562808.

The spelling of 1820794820 in words is "one billion, eight hundred twenty million, seven hundred ninety-four thousand, eight hundred twenty".