20102220655 has 24 divisors (see below), whose sum is σ = 26525002896. Its totient is φ = 14614279680.

The previous prime is 20102220653. The next prime is 20102220659. The reversal of 20102220655 is 55602220102.

It is a happy number.

It is not a de Polignac number, because 20102220655 - 2¹ = 20102220653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102220653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2296447 + ... + 2305183.

It is an arithmetic number, because the mean of its divisors is an integer number (1105208454).

Almost surely, 2^20102220655 is an apocalyptic number.

20102220655 is a deficient number, since it is larger than the sum of its proper divisors (6422782241).

20102220655 is a wasteful number, since it uses less digits than its factorization.

20102220655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567 (or 12556 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20102220655 its reverse (55602220102), we get a palindrome (75704440757).

The spelling of 20102220655 in words is "twenty billion, one hundred two million, two hundred twenty thousand, six hundred fifty-five".