20211022206 has 64 divisors (see below), whose sum is σ = 45381980160. Its totient is φ = 6666857280.

The previous prime is 20211022177. The next prime is 20211022207. The reversal of 20211022206 is 60222011202.

It is a super-2 number, since 2×20211022206² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211022207) 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, 9573091 + ... + 9575201.

It is an arithmetic number, because the mean of its divisors is an integer number (709093440).

Almost surely, 2^20211022206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211022206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22690990080).

20211022206 is an abundant number, since it is smaller than the sum of its proper divisors (25170957954).

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

20211022206 is a wasteful number, since it uses less digits than its factorization.

20211022206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886 (or 3880 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20211022206 its reverse (60222011202), we get a palindrome (80433033408).

The spelling of 20211022206 in words is "twenty billion, two hundred eleven million, twenty-two thousand, two hundred six".