20697975755 has 16 divisors (see below), whose sum is σ = 26335666080. Its totient is φ = 15572374272.

The previous prime is 20697975707. The next prime is 20697975769. The reversal of 20697975755 is 55757979602.

It is a cyclic number.

It is not a de Polignac number, because 20697975755 - 2⁶ = 20697975691 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 782144 + ... + 808173.

It is an arithmetic number, because the mean of its divisors is an integer number (1645979130).

Almost surely, 2^20697975755 is an apocalyptic number.

20697975755 is a deficient number, since it is larger than the sum of its proper divisors (5637690325).

20697975755 is a wasteful number, since it uses less digits than its factorization.

20697975755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590478.

The product of its (nonzero) digits is 41674500, while the sum is 62.

The spelling of 20697975755 in words is "twenty billion, six hundred ninety-seven million, nine hundred seventy-five thousand, seven hundred fifty-five".