20001120001020 has 240 divisors, whose sum is σ = 63153055982016. Its totient is φ = 5298939648000.

The previous prime is 20001120001007. The next prime is 20001120001151. The reversal of 20001120001020 is 2010002110002.

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 = 20001120000993 and 20001120001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 302276740 + ... + 302342900.

Almost surely, 2^{20001120001020} is an apocalyptic number.

20001120001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001120001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31576527991008).

20001120001020 is an abundant number, since it is smaller than the sum of its proper divisors (43151935980996).

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

20001120001020 is a wasteful number, since it uses less digits than its factorization.

20001120001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67394 (or 67383 counting only the distinct ones).

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

Adding to 20001120001020 its reverse (2010002110002), we get a palindrome (22011122111022).

The spelling of 20001120001020 in words is "twenty trillion, one billion, one hundred twenty million, one thousand, twenty".