20265981552 has 120 divisors (see below), whose sum is σ = 59778118400. Its totient is φ = 6391592064.

The previous prime is 20265981517. The next prime is 20265981557. The reversal of 20265981552 is 25518956202.

20265981552 is a `hidden beast` number, since 2 + 0 + 2 + 6 + 5 + 98 + 1 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20265981498 and 20265981507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20265981557) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2345913 + ... + 2354535.

Almost surely, 2^20265981552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20265981552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29889059200).

20265981552 is an abundant number, since it is smaller than the sum of its proper divisors (39512136848).

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

20265981552 is a wasteful number, since it uses less digits than its factorization.

20265981552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515 (or 9506 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 20265981552 in words is "twenty billion, two hundred sixty-five million, nine hundred eighty-one thousand, five hundred fifty-two".