1820011020 has 24 divisors (see below), whose sum is σ = 5096031024. Its totient is φ = 485336256.

The previous prime is 1820011009. The next prime is 1820011027. The reversal of 1820011020 is 201100281.

It is a super-2 number, since 2×1820011020² = 6624880225842880800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1820011027) 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, 15166699 + ... + 15166818.

It is an arithmetic number, because the mean of its divisors is an integer number (212334626).

Almost surely, 2^1820011020 is an apocalyptic number.

1820011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820011020 is an abundant number, since it is smaller than the sum of its proper divisors (3276020004).

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

1820011020 is a wasteful number, since it uses less digits than its factorization.

1820011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30333529 (or 30333527 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1820011020 is about 42661.5871715997. The cubic root of 1820011020 is about 1220.9316139615.

The spelling of 1820011020 in words is "one billion, eight hundred twenty million, eleven thousand, twenty".