1020111001820 has 48 divisors (see below), whose sum is σ = 2178726318720. Its totient is φ = 401094482496.

The previous prime is 1020111001817. The next prime is 1020111001883. The reversal of 1020111001820 is 281001110201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17485619 + ... + 17543861.

It is an arithmetic number, because the mean of its divisors is an integer number (45390131640).

Almost surely, 2^{1020111001820} is an apocalyptic number.

1020111001820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020111001820 is an abundant number, since it is smaller than the sum of its proper divisors (1158615316900).

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

1020111001820 is a wasteful number, since it uses less digits than its factorization.

1020111001820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73154 (or 73152 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

The spelling of 1020111001820 in words is "one trillion, twenty billion, one hundred eleven million, one thousand, eight hundred twenty".