2001201020 has 96 divisors (see below), whose sum is σ = 5397331968. Its totient is φ = 605797632.

The previous prime is 2001201017. The next prime is 2001201023. The reversal of 2001201020 is 201021002.

It is an interprime number because it is at equal distance from previous prime (2001201017) and next prime (2001201023).

It is a junction number, because it is equal to n+sod(n) for n = 2001200989 and 2001201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001201023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17957 + ... + 65763.

It is an arithmetic number, because the mean of its divisors is an integer number (56222208).

Almost surely, 2^2001201020 is an apocalyptic number.

2001201020 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 2001201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2698665984).

2001201020 is an abundant number, since it is smaller than the sum of its proper divisors (3396130948).

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

2001201020 is a wasteful number, since it uses less digits than its factorization.

2001201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47859 (or 47857 counting only the distinct ones).

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

The square root of 2001201020 is about 44734.7853465287. The cubic root of 2001201020 is about 1260.1731978257.

Adding to 2001201020 its reverse (201021002), we get a palindrome (2202222022).

The spelling of 2001201020 in words is "two billion, one million, two hundred one thousand, twenty".