20528640000 has 910 divisors, whose sum is σ = 83905294836. Its totient is φ = 4976640000.

The previous prime is 20528639987. The next prime is 20528640029. The reversal of 20528640000 is 4682502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 1866239995 + ... + 1866240005.

Almost surely, 2^20528640000 is an apocalyptic number.

20528640000 is a gapful number since it is divisible by the number (20) 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 20528640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41952647418).

20528640000 is an abundant number, since it is smaller than the sum of its proper divisors (63376654836).

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

20528640000 is an frugal number, since it uses more digits than its factorization.

20528640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 20528640000 in words is "twenty billion, five hundred twenty-eight million, six hundred forty thousand".