18820436560 has 20 divisors (see below), whose sum is σ = 43757515188. Its totient is φ = 7528174592.

The previous prime is 18820436507. The next prime is 18820436561. The reversal of 18820436560 is 6563402881.

It can be written as a sum of positive squares in 2 ways, for example, as 14279294016 + 4541142544 = 119496^2 + 67388^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820436561) 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, 117627649 + ... + 117627808.

Almost surely, 2^18820436560 is an apocalyptic number.

18820436560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18820436560 is an abundant number, since it is smaller than the sum of its proper divisors (24937078628).

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

18820436560 is a wasteful number, since it uses less digits than its factorization.

18820436560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235255470 (or 235255464 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 18820436560 in words is "eighteen billion, eight hundred twenty million, four hundred thirty-six thousand, five hundred sixty".