20061566784 has 784 divisors, whose sum is σ = 74358276480. Its totient is φ = 5240401920.

The previous prime is 20061566783. The next prime is 20061566797. The reversal of 20061566784 is 48766516002.

20061566784 is a `hidden beast` number, since 2 + 0 + 0 + 6 + 1 + 566 + 7 + 84 = 666.

It is a super-3 number, since 3×20061566784³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20061566783) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 328878114 + ... + 328878174.

Almost surely, 2^20061566784 is an apocalyptic number.

20061566784 is a gapful number since it is divisible by the number (24) 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 20061566784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37179138240).

20061566784 is an abundant number, since it is smaller than the sum of its proper divisors (54296709696).

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

20061566784 is an equidigital number, since it uses as much as digits as its factorization.

20061566784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20061566784 in words is "twenty billion, sixty-one million, five hundred sixty-six thousand, seven hundred eighty-four".