1808197020 has 252 divisors, whose sum is σ = 6625337544. Its totient is φ = 413138880.

The previous prime is 1808197007. The next prime is 1808197021. The reversal of 1808197020 is 207918081.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808197021) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 713155 + ... + 715685.

It is an arithmetic number, because the mean of its divisors is an integer number (26291022).

Almost surely, 2^1808197020 is an apocalyptic number.

1808197020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1808197020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3312668772).

1808197020 is an abundant number, since it is smaller than the sum of its proper divisors (4817140524).

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

1808197020 is a wasteful number, since it uses less digits than its factorization.

1808197020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2548 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 1808197020 is about 42522.8999481456. The cubic root of 1808197020 is about 1218.2841192127.

The spelling of 1808197020 in words is "one billion, eight hundred eight million, one hundred ninety-seven thousand, twenty".