20191060638 has 240 divisors, whose sum is σ = 54671934720. Its totient is φ = 5369009184.

The previous prime is 20191060627. The next prime is 20191060639. The reversal of 20191060638 is 83606019102.

20191060638 is a `hidden beast` number, since 2 + 0 + 1 + 9 + 10 + 6 + 0 + 638 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191060639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 55016331 + ... + 55016697.

It is an arithmetic number, because the mean of its divisors is an integer number (227799728).

Almost surely, 2^20191060638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20191060638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27335967360).

20191060638 is an abundant number, since it is smaller than the sum of its proper divisors (34480874082).

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

20191060638 is a wasteful number, since it uses less digits than its factorization.

20191060638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 20191060638 in words is "twenty billion, one hundred ninety-one million, sixty thousand, six hundred thirty-eight".