20378184625 has 8 divisors (see below), whose sum is σ = 25431974568. Its totient is φ = 16302547600.

The previous prime is 20378184623. The next prime is 20378184641. The reversal of 20378184625 is 52648187302.

It can be written as a sum of positive squares in 4 ways, for example, as 1921331889 + 18456852736 = 43833^2 + 135856^2 .

It is not a de Polignac number, because 20378184625 - 2¹ = 20378184623 is a prime.

It is a super-2 number, since 2×20378184625² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20378184623) 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, 81512614 + ... + 81512863.

It is an arithmetic number, because the mean of its divisors is an integer number (3178996821).

Almost surely, 2^20378184625 is an apocalyptic number.

20378184625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20378184625 is a deficient number, since it is larger than the sum of its proper divisors (5053789943).

20378184625 is an equidigital number, since it uses as much as digits as its factorization.

20378184625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163025492 (or 163025482 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20378184625 in words is "twenty billion, three hundred seventy-eight million, one hundred eighty-four thousand, six hundred twenty-five".