20663427456 has 512 divisors, whose sum is σ = 73322496000. Its totient is φ = 5604526080.

The previous prime is 20663427443. The next prime is 20663427511. The reversal of 20663427456 is 65472436602.

20663427456 is a `hidden beast` number, since 2 + 0 + 6 + 634 + 2 + 7 + 4 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44246935 + ... + 44247401.

It is an arithmetic number, because the mean of its divisors is an integer number (143208000).

Almost surely, 2^20663427456 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 20663427456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36661248000).

20663427456 is an abundant number, since it is smaller than the sum of its proper divisors (52659068544).

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

20663427456 is a wasteful number, since it uses less digits than its factorization.

20663427456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 45.

The spelling of 20663427456 in words is "twenty billion, six hundred sixty-three million, four hundred twenty-seven thousand, four hundred fifty-six".