20655400255 has 16 divisors (see below), whose sum is σ = 28444958784. Its totient is φ = 14104926720.

The previous prime is 20655400229. The next prime is 20655400273. The reversal of 20655400255 is 55200455602.

It is not a de Polignac number, because 20655400255 - 2¹⁷ = 20655269183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20655400255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1215952 + ... + 1232821.

It is an arithmetic number, because the mean of its divisors is an integer number (1777809924).

Almost surely, 2^20655400255 is an apocalyptic number.

20655400255 is a deficient number, since it is larger than the sum of its proper divisors (7789558529).

20655400255 is a wasteful number, since it uses less digits than its factorization.

20655400255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449026.

The product of its (nonzero) digits is 60000, while the sum is 34.

Adding to 20655400255 its reverse (55200455602), we get a palindrome (75855855857).

The spelling of 20655400255 in words is "twenty billion, six hundred fifty-five million, four hundred thousand, two hundred fifty-five".