20915008000 has 160 divisors (see below), whose sum is σ = 52482109680. Its totient is φ = 8313241600.

The previous prime is 20915007977. The next prime is 20915008031. The reversal of 20915008000 is 80051902.

It can be written as a sum of positive squares in 8 ways, for example, as 3334369536 + 17580638464 = 57744^2 + 132592^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11071056 + ... + 11072944.

Almost surely, 2^20915008000 is an apocalyptic number.

20915008000 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 20915008000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26241054840).

20915008000 is an abundant number, since it is smaller than the sum of its proper divisors (31567101680).

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

20915008000 is an equidigital number, since it uses as much as digits as its factorization.

20915008000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2069 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 20915008000 its reverse (80051902), we get a palindrome (20995059902).

The spelling of 20915008000 in words is "twenty billion, nine hundred fifteen million, eight thousand".