20025115264 has 128 divisors (see below), whose sum is σ = 51453532800. Its totient is φ = 7532851200.

The previous prime is 20025115261. The next prime is 20025115273. The reversal of 20025115264 is 46251152002.

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

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20025115261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250794 + ... + 320854.

It is an arithmetic number, because the mean of its divisors is an integer number (401980725).

Almost surely, 2^20025115264 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 20025115264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25726766400).

20025115264 is an abundant number, since it is smaller than the sum of its proper divisors (31428417536).

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

20025115264 is a wasteful number, since it uses less digits than its factorization.

20025115264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70122 (or 70110 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 20025115264 its reverse (46251152002), we get a palindrome (66276267266).

The spelling of 20025115264 in words is "twenty billion, twenty-five million, one hundred fifteen thousand, two hundred sixty-four".