20485184320 has 28 divisors (see below), whose sum is σ = 48780345924. Its totient is φ = 8194073600.

The previous prime is 20485184311. The next prime is 20485184329. The reversal of 20485184320 is 2348158402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20485184311) and next prime (20485184329).

It can be written as a sum of positive squares in 2 ways, for example, as 11787010624 + 8698173696 = 108568^2 + 93264^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20485184320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485184329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32007781 + ... + 32008420.

Almost surely, 2^20485184320 is an apocalyptic number.

20485184320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20485184320 is an abundant number, since it is smaller than the sum of its proper divisors (28295161604).

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

20485184320 is an equidigital number, since it uses as much as digits as its factorization.

20485184320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64016218 (or 64016208 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The spelling of 20485184320 in words is "twenty billion, four hundred eighty-five million, one hundred eighty-four thousand, three hundred twenty".