20978260875 has 160 divisors (see below), whose sum is σ = 45950224320. Its totient is φ = 9388224000.

The previous prime is 20978260861. The next prime is 20978260909. The reversal of 20978260875 is 57806287902.

It is a happy number.

20978260875 is a `hidden beast` number, since 20 + 9 + 7 + 8 + 2 + 608 + 7 + 5 = 666.

It is not a de Polignac number, because 20978260875 - 2⁹ = 20978260363 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1440631 + ... + 1455119.

It is an arithmetic number, because the mean of its divisors is an integer number (287188902).

Almost surely, 2^20978260875 is an apocalyptic number.

20978260875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20978260875 is an abundant number, since it is smaller than the sum of its proper divisors (24971963445).

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

20978260875 is a wasteful number, since it uses less digits than its factorization.

20978260875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14540 (or 14521 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 20978260875 in words is "twenty billion, nine hundred seventy-eight million, two hundred sixty thousand, eight hundred seventy-five".