20135528826 has 64 divisors (see below), whose sum is σ = 46691040000. Its totient is φ = 5669761536.

The previous prime is 20135528821. The next prime is 20135528869. The reversal of 20135528826 is 62882553102.

It is a happy number.

20135528826 is a nontrivial binomial coefficient, being equal to C(200677, 2).

It is a super-2 number, since 2×20135528826² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20135528821) 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 31 ways as a sum of consecutive naturals, for example, 7323300 + ... + 7326048.

It is an arithmetic number, because the mean of its divisors is an integer number (729547500).

Almost surely, 2^20135528826 is an apocalyptic number.

20135528826 is the 200676-th triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20135528826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23345520000).

20135528826 is an abundant number, since it is smaller than the sum of its proper divisors (26555511174).

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

20135528826 is a wasteful number, since it uses less digits than its factorization.

20135528826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5223.

The product of its (nonzero) digits is 230400, while the sum is 42.

It can be divided in two parts, 201355 and 28826, that added together give a triangular number (230181 = T₆₇₈).

The spelling of 20135528826 in words is "twenty billion, one hundred thirty-five million, five hundred twenty-eight thousand, eight hundred twenty-six".