20651642528 has 48 divisors (see below), whose sum is σ = 44426219040. Its totient is φ = 9371846400.

The previous prime is 20651642521. The next prime is 20651642567. The reversal of 20651642528 is 82524615602.

It is not an unprimeable number, because it can be changed into a prime (20651642521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170498 + ... + 265278.

It is an arithmetic number, because the mean of its divisors is an integer number (925546230).

Almost surely, 2^20651642528 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 20651642528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22213109520).

20651642528 is an abundant number, since it is smaller than the sum of its proper divisors (23774576512).

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

20651642528 is a wasteful number, since it uses less digits than its factorization.

20651642528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95421 (or 95413 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20651642528 in words is "twenty billion, six hundred fifty-one million, six hundred forty-two thousand, five hundred twenty-eight".