20816605140 has 48 divisors (see below), whose sum is σ = 58381065792. Its totient is φ = 5542087936.

The previous prime is 20816605129. The next prime is 20816605141. The reversal of 20816605140 is 4150661802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816605141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244134 + ... + 318173.

It is an arithmetic number, because the mean of its divisors is an integer number (1216272204).

Almost surely, 2^20816605140 is an apocalyptic number.

20816605140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20816605140 is an abundant number, since it is smaller than the sum of its proper divisors (37564460652).

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

20816605140 is a wasteful number, since it uses less digits than its factorization.

20816605140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562936 (or 562934 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 20816605140 in words is "twenty billion, eight hundred sixteen million, six hundred five thousand, one hundred forty".