20887707456 has 504 divisors, whose sum is σ = 79998478560. Its totient is φ = 5138380800.

The previous prime is 20887707427. The next prime is 20887707461. The reversal of 20887707456 is 65470778802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5897046 + ... + 5900586.

It is an arithmetic number, because the mean of its divisors is an integer number (158727140).

Almost surely, 2^20887707456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20887707456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39999239280).

20887707456 is an abundant number, since it is smaller than the sum of its proper divisors (59110771104).

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

20887707456 is a wasteful number, since it uses less digits than its factorization.

20887707456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603 (or 3583 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 54.

The spelling of 20887707456 in words is "twenty billion, eight hundred eighty-seven million, seven hundred seven thousand, four hundred fifty-six".