20489792447520 has 768 divisors, whose sum is σ = 79143169996800. Its totient is φ = 4909693685760.

The previous prime is 20489792447503. The next prime is 20489792447521. The reversal of 20489792447520 is 2574429798402.

It is a happy number.

20489792447520 is a `hidden beast` number, since 2 + 0 + 4 + 89 + 7 + 9 + 24 + 4 + 7 + 520 = 666.

It is not an unprimeable number, because it can be changed into a prime (20489792447521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2374522566 + ... + 2374531194.

It is an arithmetic number, because the mean of its divisors is an integer number (103051002600).

Almost surely, 2^{20489792447520} is an apocalyptic number.

20489792447520 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 20489792447520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39571584998400).

20489792447520 is an abundant number, since it is smaller than the sum of its proper divisors (58653377549280).

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

20489792447520 is a wasteful number, since it uses less digits than its factorization.

20489792447520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9238 (or 9224 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 63.

The spelling of 20489792447520 in words is "twenty trillion, four hundred eighty-nine billion, seven hundred ninety-two million, four hundred forty-seven thousand, five hundred twenty".