20894384975 has 6 divisors (see below), whose sum is σ = 25909037400. Its totient is φ = 16715507960.

The previous prime is 20894384963. The next prime is 20894384977. The reversal of 20894384975 is 57948349802.

It is a happy number.

It is not a de Polignac number, because 20894384975 - 2¹² = 20894380879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894384977) 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 5 ways as a sum of consecutive naturals, for example, 417887675 + ... + 417887724.

It is an arithmetic number, because the mean of its divisors is an integer number (4318172900).

Almost surely, 2^20894384975 is an apocalyptic number.

20894384975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20894384975 is a deficient number, since it is larger than the sum of its proper divisors (5014652425).

20894384975 is an equidigital number, since it uses as much as digits as its factorization.

20894384975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835775409 (or 835775404 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 20894384975 in words is "twenty billion, eight hundred ninety-four million, three hundred eighty-four thousand, nine hundred seventy-five".