20436173227540 has 48 divisors (see below), whose sum is σ = 49737615992064. Its totient is φ = 6908002214400.

The previous prime is 20436173227529. The next prime is 20436173227541. The reversal of 20436173227540 is 4572237163402.

It is a super-2 number, since 2×20436173227540² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436173227541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027966581 + ... + 1027986460.

It is an arithmetic number, because the mean of its divisors is an integer number (1036200333168).

Almost surely, 2^{20436173227540} is an apocalyptic number.

20436173227540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20436173227540 is an abundant number, since it is smaller than the sum of its proper divisors (29301442764524).

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

20436173227540 is a wasteful number, since it uses less digits than its factorization.

20436173227540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055953128 (or 2055953126 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 46.

The spelling of 20436173227540 in words is "twenty trillion, four hundred thirty-six billion, one hundred seventy-three million, two hundred twenty-seven thousand, five hundred forty".