20647704960 has 768 divisors, whose sum is σ = 79995988800. Its totient is φ = 4883742720.

The previous prime is 20647704901. The next prime is 20647704971. The reversal of 20647704960 is 6940774602.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 148544571 + ... + 148544709.

Almost surely, 2^20647704960 is an apocalyptic number.

20647704960 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 20647704960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39997994400).

20647704960 is an abundant number, since it is smaller than the sum of its proper divisors (59348283840).

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

20647704960 is a wasteful number, since it uses less digits than its factorization.

20647704960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20647704960 in words is "twenty billion, six hundred forty-seven million, seven hundred four thousand, nine hundred sixty".