20843885520 has 100 divisors (see below), whose sum is σ = 72393924900. Its totient is φ = 5558367744.

The previous prime is 20843885519. The next prime is 20843885537. The reversal of 20843885520 is 2558834802.

20843885520 is a `hidden beast` number, since 2 + 0 + 8 + 43 + 8 + 85 + 520 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12892239936 + 7951645584 = 113544^2 + 89172^2 .

It is a super-3 number, since 3×20843885520³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 1601845 + ... + 1614804.

It is an arithmetic number, because the mean of its divisors is an integer number (723939249).

Almost surely, 2^20843885520 is an apocalyptic number.

20843885520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20843885520 is an abundant number, since it is smaller than the sum of its proper divisors (51550039380).

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

20843885520 is a wasteful number, since it uses less digits than its factorization.

20843885520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216674 (or 3216659 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 20843885520 in words is "twenty billion, eight hundred forty-three million, eight hundred eighty-five thousand, five hundred twenty".