20528803968 has 128 divisors (see below), whose sum is σ = 59728752000. Its totient is φ = 6218268672.

The previous prime is 20528803963. The next prime is 20528803979. The reversal of 20528803968 is 86930882502.

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 (51).

It is a self number, because there is not a number n which added to its sum of digits gives 20528803968.

It is not an unprimeable number, because it can be changed into a prime (20528803963) 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, 135093 + ... + 243531.

It is an arithmetic number, because the mean of its divisors is an integer number (466630875).

Almost surely, 2^20528803968 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 20528803968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29864376000).

20528803968 is an abundant number, since it is smaller than the sum of its proper divisors (39199948032).

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

20528803968 is a wasteful number, since it uses less digits than its factorization.

20528803968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108502 (or 108490 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 20528803968 in words is "twenty billion, five hundred twenty-eight million, eight hundred three thousand, nine hundred sixty-eight".