20202055666 has 16 divisors (see below), whose sum is σ = 32636498328. Its totient is φ = 9323337600.

The previous prime is 20202055613. The next prime is 20202055667. The reversal of 20202055666 is 66655020202.

It can be written as a sum of positive squares in 4 ways, for example, as 19215781641 + 986274025 = 138621^2 + 31405^2 .

It is not an unprimeable number, because it can be changed into a prime (20202055667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553296 + ... + 588676.

Almost surely, 2^20202055666 is an apocalyptic number.

20202055666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20202055666 is a deficient number, since it is larger than the sum of its proper divisors (12434442662).

20202055666 is a wasteful number, since it uses less digits than its factorization.

20202055666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57357.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 20202055666 its reverse (66655020202), we get a palindrome (86857075868).

The spelling of 20202055666 in words is "twenty billion, two hundred two million, fifty-five thousand, six hundred sixty-six".