1001202010020 has 72 divisors (see below), whose sum is σ = 3111052122360. Its totient is φ = 260475317760.

The previous prime is 1001202010009. The next prime is 1001202010021. The reversal of 1001202010020 is 200102021001.

It can be written as a sum of positive squares in 4 ways, for example, as 36166910976 + 965035099044 = 190176^2 + 982362^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001202009984 and 1001202010011.

It is not an unprimeable number, because it can be changed into a prime (1001202010021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67824735 + ... + 67839494.

It is an arithmetic number, because the mean of its divisors is an integer number (43209057255).

Almost surely, 2^{1001202010020} is an apocalyptic number.

1001202010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001202010020 is an abundant number, since it is smaller than the sum of its proper divisors (2109850112340).

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

1001202010020 is a wasteful number, since it uses less digits than its factorization.

1001202010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135664285 (or 135664280 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1001202010020 its reverse (200102021001), we get a palindrome (1201304031021).

The spelling of 1001202010020 in words is "one trillion, one billion, two hundred two million, ten thousand, twenty".