20647481602500 has 135 divisors (see below), whose sum is σ = 65221582579153. Its totient is φ = 5505813336000.

The previous prime is 20647481602483. The next prime is 20647481602519. The reversal of 20647481602500 is 520618474602.

The square root of 20647481602500 is 4543950.

It is a perfect power (a square), and thus also a powerful number.

20647481602500 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 7 + 4 + 81 + 60 + 2 + 500 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 17193147117444 + 3454334485056 = 4146462^2 + 1858584^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 681577354 + ... + 681607646.

Almost surely, 2^{20647481602500} is an apocalyptic number.

20647481602500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20647481602500 is the 4543950-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20647481602500

20647481602500 is an abundant number, since it is smaller than the sum of its proper divisors (44574100976653).

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

20647481602500 is an frugal number, since it uses more digits than its factorization.

20647481602500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60616 (or 30303 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 20647481602500 in words is "twenty trillion, six hundred forty-seven billion, four hundred eighty-one million, six hundred two thousand, five hundred".