20540089836 has 240 divisors, whose sum is σ = 63017450496. Its totient is φ = 5712166656.

The previous prime is 20540089781. The next prime is 20540089837. The reversal of 20540089836 is 63898004502.

20540089836 is a `hidden beast` number, since 20 + 540 + 0 + 8 + 9 + 83 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20540089791 and 20540089800.

It is not an unprimeable number, because it can be changed into a prime (20540089837) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 24836455 + ... + 24837281.

Almost surely, 2^20540089836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20540089836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31508725248).

20540089836 is an abundant number, since it is smaller than the sum of its proper divisors (42477360660).

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

20540089836 is a wasteful number, since it uses less digits than its factorization.

20540089836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20540089836 in words is "twenty billion, five hundred forty million, eighty-nine thousand, eight hundred thirty-six".