20845090818 has 12 divisors (see below), whose sum is σ = 45164363478. Its totient is φ = 6948363600.

The previous prime is 20845090793. The next prime is 20845090823. The reversal of 20845090818 is 81809054802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15411484449 + 5433606369 = 124143^2 + 73713^2 .

It is a super-2 number, since 2×20845090818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 579030283 + ... + 579030318.

Almost surely, 2^20845090818 is an apocalyptic number.

20845090818 is an abundant number, since it is smaller than the sum of its proper divisors (24319272660).

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

20845090818 is a wasteful number, since it uses less digits than its factorization.

20845090818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158060609 (or 1158060606 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 20845090818 in words is "twenty billion, eight hundred forty-five million, ninety thousand, eight hundred eighteen".