20525111988 has 48 divisors (see below), whose sum is σ = 50509240320. Its totient is φ = 6469183584.

The previous prime is 20525111983. The next prime is 20525111989. The reversal of 20525111988 is 88911152502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525111983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33181 + ... + 205307.

It is an arithmetic number, because the mean of its divisors is an integer number (1052275840).

Almost surely, 2^20525111988 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 20525111988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25254620160).

20525111988 is an abundant number, since it is smaller than the sum of its proper divisors (29984128332).

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

20525111988 is a wasteful number, since it uses less digits than its factorization.

20525111988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172676 (or 172674 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 42.

The spelling of 20525111988 in words is "twenty billion, five hundred twenty-five million, one hundred eleven thousand, nine hundred eighty-eight".