20818833444 has 36 divisors (see below), whose sum is σ = 55395143440. Its totient is φ = 6574368240.

The previous prime is 20818833439. The next prime is 20818833449. The reversal of 20818833444 is 44433881802.

It is a happy number.

20818833444 is a `hidden beast` number, since 20 + 8 + 188 + 3 + 3 + 444 = 666.

It is an interprime number because it is at equal distance from previous prime (20818833439) and next prime (20818833449).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20818833444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20818833444.

It is not an unprimeable number, because it can be changed into a prime (20818833449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15217762 + ... + 15219129.

Almost surely, 2^20818833444 is an apocalyptic number.

It is an amenable number.

20818833444 is an abundant number, since it is smaller than the sum of its proper divisors (34576309996).

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

20818833444 is a wasteful number, since it uses less digits than its factorization.

20818833444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30436920 (or 30436915 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 20818833444 in words is "twenty billion, eight hundred eighteen million, eight hundred thirty-three thousand, four hundred forty-four".