20745622818 has 54 divisors (see below), whose sum is σ = 47772353811. Its totient is φ = 6505171584.

The previous prime is 20745622817. The next prime is 20745622831. The reversal of 20745622818 is 81822654702.

20745622818 is a `hidden beast` number, since 2 + 0 + 7 + 4 + 5 + 622 + 8 + 18 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 3987543609 + 16758079209 = 63147^2 + 129453^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101847.

It is a super-2 number, since 2×20745622818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20745622817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10387396 + ... + 10389392.

Almost surely, 2^20745622818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20745622818

20745622818 is an abundant number, since it is smaller than the sum of its proper divisors (27026730993).

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

20745622818 is an equidigital number, since it uses as much as digits as its factorization.

20745622818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 20745622818 in words is "twenty billion, seven hundred forty-five million, six hundred twenty-two thousand, eight hundred eighteen".