20287988245560 has 384 divisors, whose sum is σ = 71857557838080. Its totient is φ = 4568366702592.

The previous prime is 20287988245463. The next prime is 20287988245561. The reversal of 20287988245560 is 6554288978202.

It is a junction number, because it is equal to n+sod(n) for n = 20287988245491 and 20287988245500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287988245561) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 172219239 + ... + 172337001.

It is an arithmetic number, because the mean of its divisors is an integer number (187129056870).

Almost surely, 2^{20287988245560} is an apocalyptic number.

20287988245560 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 20287988245560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35928778919040).

20287988245560 is an abundant number, since it is smaller than the sum of its proper divisors (51569569592520).

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

20287988245560 is a wasteful number, since it uses less digits than its factorization.

20287988245560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118227 (or 118216 counting only the distinct ones).

The product of its (nonzero) digits is 154828800, while the sum is 66.

The spelling of 20287988245560 in words is "twenty trillion, two hundred eighty-seven billion, nine hundred eighty-eight million, two hundred forty-five thousand, five hundred sixty".