1001011020 has 24 divisors (see below), whose sum is σ = 2802831024. Its totient is φ = 266936256.

The previous prime is 1001011019. The next prime is 1001011069. The reversal of 1001011020 is 201101001.

It is a super-2 number, since 2×1001011020² = 2004046124322880800, which contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8341699 + ... + 8341818.

It is an arithmetic number, because the mean of its divisors is an integer number (116784626).

Almost surely, 2^1001011020 is an apocalyptic number.

1001011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001011020 is an abundant number, since it is smaller than the sum of its proper divisors (1801820004).

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

1001011020 is a wasteful number, since it uses less digits than its factorization.

1001011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16683529 (or 16683527 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1001011020 is about 31638.7581930770. The cubic root of 1001011020 is about 1000.3368931569.

Adding to 1001011020 its reverse (201101001), we get a palindrome (1202112021).

The spelling of 1001011020 in words is "one billion, one million, eleven thousand, twenty".