20545774416 has 140 divisors (see below), whose sum is σ = 59939704660. Its totient is φ = 6819240960.

The previous prime is 20545774369. The next prime is 20545774423. The reversal of 20545774416 is 61447754502.

20545774416 is a `hidden beast` number, since 20 + 5 + 4 + 577 + 44 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12374337600 + 8171436816 = 111240^2 + 90396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2807370 + ... + 2814678.

Almost surely, 2^20545774416 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 20545774416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29969852330).

20545774416 is an abundant number, since it is smaller than the sum of its proper divisors (39393930244).

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

20545774416 is an equidigital number, since it uses as much as digits as its factorization.

20545774416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7576 (or 7555 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 45.

The spelling of 20545774416 in words is "twenty billion, five hundred forty-five million, seven hundred seventy-four thousand, four hundred sixteen".