20255911008 has 24 divisors (see below), whose sum is σ = 53171766648. Its totient is φ = 6751970304.

The previous prime is 20255911007. The next prime is 20255911019. The reversal of 20255911008 is 80011955202.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20255911008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255911003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105499441 + ... + 105499632.

It is an arithmetic number, because the mean of its divisors is an integer number (2215490277).

Almost surely, 2^20255911008 is an apocalyptic number.

It is an amenable number.

20255911008 is an abundant number, since it is smaller than the sum of its proper divisors (32915855640).

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

20255911008 is a wasteful number, since it uses less digits than its factorization.

20255911008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210999086 (or 210999078 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 20255911008 in words is "twenty billion, two hundred fifty-five million, nine hundred eleven thousand, eight".