20265099648 has 128 divisors (see below), whose sum is σ = 56769120000. Its totient is φ = 6387443712.

The previous prime is 20265099607. The next prime is 20265099677. The reversal of 20265099648 is 84699056202.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 20265099648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4367986 + ... + 4372622.

It is an arithmetic number, because the mean of its divisors is an integer number (443508750).

Almost surely, 2^20265099648 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 20265099648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28384560000).

20265099648 is an abundant number, since it is smaller than the sum of its proper divisors (36504020352).

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

20265099648 is a wasteful number, since it uses less digits than its factorization.

20265099648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272 (or 5260 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 20265099648 in words is "twenty billion, two hundred sixty-five million, ninety-nine thousand, six hundred forty-eight".