1001002020 has 48 divisors (see below), whose sum is σ = 2842293888. Its totient is φ = 263173120.

The previous prime is 1001002001. The next prime is 1001002049. The reversal of 1001002020 is 202001001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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 15 ways as a sum of consecutive naturals, for example, 113229 + ... + 121748.

It is an arithmetic number, because the mean of its divisors is an integer number (59214456).

Almost surely, 2^1001002020 is an apocalyptic number.

1001002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001002020 is an abundant number, since it is smaller than the sum of its proper divisors (1841291868).

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

1001002020 is a wasteful number, since it uses less digits than its factorization.

1001002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235060 (or 235058 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1001002020 is about 31638.6159621435. The cubic root of 1001002020 is about 1000.3338951683. Note that the first 3 decimals are identical.

Adding to 1001002020 its reverse (202001001), we get a palindrome (1203003021).

The spelling of 1001002020 in words is "one billion, one million, two thousand, twenty".