1000020100020 has 48 divisors (see below), whose sum is σ = 2833791912000. Its totient is φ = 263459109376.

The previous prime is 1000020099901. The next prime is 1000020100043. The reversal of 1000020100020 is 200010200001.

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 junction number, because it is equal to n+sod(n) for n = 1000020099981 and 1000020100008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100398645 + ... + 100408604.

It is an arithmetic number, because the mean of its divisors is an integer number (59037331500).

Almost surely, 2^{1000020100020} is an apocalyptic number.

1000020100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000020100020 is an abundant number, since it is smaller than the sum of its proper divisors (1833771811980).

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

1000020100020 is a wasteful number, since it uses less digits than its factorization.

1000020100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200807344 (or 200807342 counting only the distinct ones).

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

Adding to 1000020100020 its reverse (200010200001), we get a palindrome (1200030300021).

The spelling of 1000020100020 in words is "one trillion, twenty million, one hundred thousand, twenty".