20975450685 has 32 divisors (see below), whose sum is σ = 38374871040. Its totient is φ = 9583837248.

The previous prime is 20975450651. The next prime is 20975450779. The reversal of 20975450685 is 58605457902.

It is not a de Polignac number, because 20975450685 - 2¹⁶ = 20975385149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157324 + ... + 258266.

It is an arithmetic number, because the mean of its divisors is an integer number (1199214720).

Almost surely, 2^20975450685 is an apocalyptic number.

It is an amenable number.

20975450685 is a deficient number, since it is larger than the sum of its proper divisors (17399420355).

20975450685 is a wasteful number, since it uses less digits than its factorization.

20975450685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102937.

The product of its (nonzero) digits is 3024000, while the sum is 51.

The spelling of 20975450685 in words is "twenty billion, nine hundred seventy-five million, four hundred fifty thousand, six hundred eighty-five".