20146993878 has 64 divisors (see below), whose sum is σ = 44808422400. Its totient is φ = 5987974560.

The previous prime is 20146993877. The next prime is 20146993903. The reversal of 20146993878 is 87839964102.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20146993871) 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 31 ways as a sum of consecutive naturals, for example, 748213 + ... + 774671.

It is an arithmetic number, because the mean of its divisors is an integer number (700131600).

Almost surely, 2^20146993878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20146993878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22404211200).

20146993878 is an abundant number, since it is smaller than the sum of its proper divisors (24661428522).

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

20146993878 is a wasteful number, since it uses less digits than its factorization.

20146993878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26697.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 20146993878 in words is "twenty billion, one hundred forty-six million, nine hundred ninety-three thousand, eight hundred seventy-eight".