20001120210 has 80 divisors (see below), whose sum is σ = 53845413336. Its totient is φ = 5327223552.

The previous prime is 20001120197. The next prime is 20001120253. The reversal of 20001120210 is 1202110002.

It can be written as a sum of positive squares in 4 ways, for example, as 17037297729 + 2963822481 = 130527^2 + 54441^2 .

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 = 20001120192 and 20001120201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 679764 + ... + 708576.

Almost surely, 2^20001120210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001120210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26922706668).

20001120210 is an abundant number, since it is smaller than the sum of its proper divisors (33844293126).

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

20001120210 is a wasteful number, since it uses less digits than its factorization.

20001120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29689 (or 29680 counting only the distinct ones).

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

Adding to 20001120210 its reverse (1202110002), we get a palindrome (21203230212).

The spelling of 20001120210 in words is "twenty billion, one million, one hundred twenty thousand, two hundred ten".