20508018444 has 18 divisors (see below), whose sum is σ = 51839713380. Its totient is φ = 6836006136.

The previous prime is 20508018373. The next prime is 20508018449. The reversal of 20508018444 is 44481080502.

20508018444 is a `hidden beast` number, since 205 + 0 + 8 + 0 + 1 + 8 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20508018444² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 569667179 = 20508018444 / (2 + 0 + 5 + 0 + 8 + 0 + 1 + 8 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 20508018399 and 20508018408.

It is not an unprimeable number, because it can be changed into a prime (20508018449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284833554 + ... + 284833625.

Almost surely, 2^20508018444 is an apocalyptic number.

It is an amenable number.

20508018444 is an abundant number, since it is smaller than the sum of its proper divisors (31331694936).

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

20508018444 is a wasteful number, since it uses less digits than its factorization.

20508018444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569667189 (or 569667184 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

Adding to 20508018444 its reverse (44481080502), we get a palindrome (64989098946).

The spelling of 20508018444 in words is "twenty billion, five hundred eight million, eighteen thousand, four hundred forty-four".