2001000001020 has 96 divisors (see below), whose sum is σ = 5618893432320. Its totient is φ = 532067961600.

The previous prime is 2001000000977. The next prime is 2001000001027. The reversal of 2001000001020 is 201000001002.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001000001027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138729529 + ... + 138743951.

It is an arithmetic number, because the mean of its divisors is an integer number (58530139920).

Almost surely, 2^{2001000001020} is an apocalyptic number.

2001000001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001000001020 is an abundant number, since it is smaller than the sum of its proper divisors (3617893431300).

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

2001000001020 is a wasteful number, since it uses less digits than its factorization.

2001000001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20915 (or 20913 counting only the distinct ones).

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

Adding to 2001000001020 its reverse (201000001002), we get a palindrome (2202000002022).

The spelling of 2001000001020 in words is "two trillion, one billion, one thousand, twenty".