20146993891 has 8 divisors (see below), whose sum is σ = 20176807680. Its totient is φ = 20117203008.

The previous prime is 20146993877. The next prime is 20146993903. The reversal of 20146993891 is 19839964102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20146993891 - 2⁵ = 20146993859 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2492805 + ... + 2500873.

It is an arithmetic number, because the mean of its divisors is an integer number (2522100960).

Almost surely, 2^20146993891 is an apocalyptic number.

20146993891 is a deficient number, since it is larger than the sum of its proper divisors (29813789).

20146993891 is a wasteful number, since it uses less digits than its factorization.

20146993891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11453.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 20146993891 in words is "twenty billion, one hundred forty-six million, nine hundred ninety-three thousand, eight hundred ninety-one".