20265220170 has 128 divisors (see below), whose sum is σ = 59551430400. Its totient is φ = 4872317184.

The previous prime is 20265220163. The next prime is 20265220187. The reversal of 20265220170 is 7102256202.

20265220170 is a `hidden beast` number, since 2 + 0 + 2 + 652 + 2 + 0 + 1 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 63 ways as a sum of consecutive naturals, for example, 83796 + ... + 218064.

It is an arithmetic number, because the mean of its divisors is an integer number (465245550).

Almost surely, 2^20265220170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20265220170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29775715200).

20265220170 is an abundant number, since it is smaller than the sum of its proper divisors (39286210230).

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

20265220170 is a wasteful number, since it uses less digits than its factorization.

20265220170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134341 (or 134335 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

Adding to 20265220170 its reverse (7102256202), we get a palindrome (27367476372).

The spelling of 20265220170 in words is "twenty billion, two hundred sixty-five million, two hundred twenty thousand, one hundred seventy".