20506206222 has 12 divisors (see below), whose sum is σ = 44430113520. Its totient is φ = 6835402068.

The previous prime is 20506206221. The next prime is 20506206223. The reversal of 20506206222 is 22260260502.

It is an interprime number because it is at equal distance from previous prime (20506206221) and next prime (20506206223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506206221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 569616822 + ... + 569616857.

It is an arithmetic number, because the mean of its divisors is an integer number (3702509460).

Almost surely, 2^20506206222 is an apocalyptic number.

20506206222 is an abundant number, since it is smaller than the sum of its proper divisors (23923907298).

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

20506206222 is a wasteful number, since it uses less digits than its factorization.

20506206222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139233687 (or 1139233684 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20506206222 its reverse (22260260502), we get a palindrome (42766466724).

The spelling of 20506206222 in words is "twenty billion, five hundred six million, two hundred six thousand, two hundred twenty-two".