20715540480 has 208 divisors, whose sum is σ = 73648229760. Its totient is φ = 5523996672.

The previous prime is 20715540463. The next prime is 20715540491. The reversal of 20715540480 is 8404551702.

20715540480 is a `hidden beast` number, since 2 + 0 + 71 + 5 + 540 + 48 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 534229 + ... + 571691.

Almost surely, 2^20715540480 is an apocalyptic number.

20715540480 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 20715540480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36824114880).

20715540480 is an abundant number, since it is smaller than the sum of its proper divisors (52932689280).

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

20715540480 is an equidigital number, since it uses as much as digits as its factorization.

20715540480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37501 (or 37473 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 20715540480 in words is "twenty billion, seven hundred fifteen million, five hundred forty thousand, four hundred eighty".