20666222220 has 96 divisors (see below), whose sum is σ = 66176119296. Its totient is φ = 4720550400.

The previous prime is 20666222209. The next prime is 20666222231. The reversal of 20666222220 is 2222266602.

It is an interprime number because it is at equal distance from previous prime (20666222209) and next prime (20666222231).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644160 + ... + 675480.

It is an arithmetic number, because the mean of its divisors is an integer number (689334576).

Almost surely, 2^20666222220 is an apocalyptic number.

20666222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20666222220 is an abundant number, since it is smaller than the sum of its proper divisors (45509897076).

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

20666222220 is a wasteful number, since it uses less digits than its factorization.

20666222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32911 (or 32909 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 20666222220 its reverse (2222266602), we get a palindrome (22888488822).

The spelling of 20666222220 in words is "twenty billion, six hundred sixty-six million, two hundred twenty-two thousand, two hundred twenty".