20871448605 has 256 divisors, whose sum is σ = 45947289600. Its totient is φ = 8888527872.

The previous prime is 20871448603. The next prime is 20871448621. The reversal of 20871448605 is 50684417802.

20871448605 is a `hidden beast` number, since 20 + 8 + 7 + 14 + 4 + 8 + 605 = 666.

It is not a de Polignac number, because 20871448605 - 2¹ = 20871448603 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871448603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 164342052 + ... + 164342178.

It is an arithmetic number, because the mean of its divisors is an integer number (179481600).

Almost surely, 2^20871448605 is an apocalyptic number.

It is an amenable number.

20871448605 is an abundant number, since it is smaller than the sum of its proper divisors (25075840995).

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

20871448605 is a wasteful number, since it uses less digits than its factorization.

20871448605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 20871448605 in words is "twenty billion, eight hundred seventy-one million, four hundred forty-eight thousand, six hundred five".