2021731020 has 72 divisors (see below), whose sum is σ = 6137507376. Its totient is φ = 538695552.

The previous prime is 2021731013. The next prime is 2021731037. The reversal of 2021731020 is 201371202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2021730984 and 2021731002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264979 + ... + 272501.

It is an arithmetic number, because the mean of its divisors is an integer number (85243158).

Almost surely, 2^2021731020 is an apocalyptic number.

2021731020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021731020 is an abundant number, since it is smaller than the sum of its proper divisors (4115776356).

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

2021731020 is a wasteful number, since it uses less digits than its factorization.

2021731020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9031 (or 9026 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 2021731020 is about 44963.6633294041. The cubic root of 2021731020 is about 1264.4678499312.

The spelling of 2021731020 in words is "two billion, twenty-one million, seven hundred thirty-one thousand, twenty".