1809147020 has 24 divisors (see below), whose sum is σ = 3930217200. Its totient is φ = 698704832.

The previous prime is 1809147019. The next prime is 1809147029. The reversal of 1809147020 is 207419081.

It is not an unprimeable number, because it can be changed into a prime (1809147029) 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, 1559030 + ... + 1560189.

It is an arithmetic number, because the mean of its divisors is an integer number (163759050).

Almost surely, 2^1809147020 is an apocalyptic number.

1809147020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809147020 is an abundant number, since it is smaller than the sum of its proper divisors (2121070180).

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

1809147020 is a wasteful number, since it uses less digits than its factorization.

1809147020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119257 (or 3119255 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1809147020 is about 42534.0689330330. The cubic root of 1809147020 is about 1218.4974380179.

The spelling of 1809147020 in words is "one billion, eight hundred nine million, one hundred forty-seven thousand, twenty".