20920525108 has 72 divisors (see below), whose sum is σ = 45833082120. Its totient is φ = 8300113920.

The previous prime is 20920525103. The next prime is 20920525121. The reversal of 20920525108 is 80152502902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5890255504 + 15030269604 = 76748^2 + 122598^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920525103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151788 + ... + 254716.

It is an arithmetic number, because the mean of its divisors is an integer number (636570585).

Almost surely, 2^20920525108 is an apocalyptic number.

20920525108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20920525108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22916541060).

20920525108 is an abundant number, since it is smaller than the sum of its proper divisors (24912557012).

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

20920525108 is a wasteful number, since it uses less digits than its factorization.

20920525108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103025 (or 103016 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 20920525108 in words is "twenty billion, nine hundred twenty million, five hundred twenty-five thousand, one hundred eight".