20011020210 has 96 divisors (see below), whose sum is σ = 54839453760. Its totient is φ = 5048728704.

The previous prime is 20011020199. The next prime is 20011020221. The reversal of 20011020210 is 1202011002.

It is an interprime number because it is at equal distance from previous prime (20011020199) and next prime (20011020221).

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 = 20011020192 and 20011020201.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1355529 + ... + 1370211.

It is an arithmetic number, because the mean of its divisors is an integer number (571244310).

Almost surely, 2^20011020210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27419726880).

20011020210 is an abundant number, since it is smaller than the sum of its proper divisors (34828433550).

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

20011020210 is a wasteful number, since it uses less digits than its factorization.

20011020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15512 (or 15509 counting only the distinct ones).

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

Adding to 20011020210 its reverse (1202011002), we get a palindrome (21213031212).

The spelling of 20011020210 in words is "twenty billion, eleven million, twenty thousand, two hundred ten".