20655405225 has 144 divisors (see below), whose sum is σ = 45778375552. Its totient is φ = 8669306880.

The previous prime is 20655405193. The next prime is 20655405259. The reversal of 20655405225 is 52250455602.

20655405225 is a `hidden beast` number, since 2 + 0 + 65 + 540 + 52 + 2 + 5 = 666.

It is not a de Polignac number, because 20655405225 - 2⁵ = 20655405193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20655405225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3949062 + ... + 3954288.

Almost surely, 2^20655405225 is an apocalyptic number.

20655405225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20655405225 is an abundant number, since it is smaller than the sum of its proper divisors (25122970327).

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

20655405225 is a wasteful number, since it uses less digits than its factorization.

20655405225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5456 (or 5448 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 20655405225 in words is "twenty billion, six hundred fifty-five million, four hundred five thousand, two hundred twenty-five".