20969755 has 32 divisors (see below), whose sum is σ = 28304640. Its totient is φ = 14837760.

The previous prime is 20969723. The next prime is 20969783. The reversal of 20969755 is 55796902.

It is a happy number.

It is not a de Polignac number, because 20969755 - 2⁵ = 20969723 is a prime.

It is a zygodrome in base 8.

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 31 ways as a sum of consecutive naturals, for example, 115765 + ... + 115945.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^20969755 is an apocalyptic number.

20969755 is a deficient number, since it is larger than the sum of its proper divisors (7334885).

20969755 is a wasteful number, since it uses less digits than its factorization.

20969755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 20969755 is about 4579.2745058579. The cubic root of 20969755 is about 275.7599037439.

The spelling of 20969755 in words is "twenty million, nine hundred sixty-nine thousand, seven hundred fifty-five".