20001002101020 has 72 divisors (see below), whose sum is σ = 60885612955440. Its totient is φ = 5314619761920.

The previous prime is 20001002101019. The next prime is 20001002101039. The reversal of 20001002101020 is 2010120010002.

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 = 20001002100993 and 20001002101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197665930 + ... + 197767089.

It is an arithmetic number, because the mean of its divisors is an integer number (845633513270).

Almost surely, 2^{20001002101020} is an apocalyptic number.

20001002101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001002101020 is an abundant number, since it is smaller than the sum of its proper divisors (40884610854420).

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

20001002101020 is a wasteful number, since it uses less digits than its factorization.

20001002101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395433315 (or 395433310 counting only the distinct ones).

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

Adding to 20001002101020 its reverse (2010120010002), we get a palindrome (22011122111022).

The spelling of 20001002101020 in words is "twenty trillion, one billion, two million, one hundred one thousand, twenty".