20755969 has 8 divisors (see below), whose sum is σ = 22428392. Its totient is φ = 19094400.

The previous prime is 20755951. The next prime is 20755981. The reversal of 20755969 is 96955702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5452225 + 15303744 = 2335^2 + 3912^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20755969 - 2⁵ = 20755937 is a prime.

It is a super-2 number, since 2×20755969² = 861620498257922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20755069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1519 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (2803549).

Almost surely, 2^20755969 is an apocalyptic number.

It is an amenable number.

20755969 is a deficient number, since it is larger than the sum of its proper divisors (1672423).

20755969 is a wasteful number, since it uses less digits than its factorization.

20755969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5427.

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

The square root of 20755969 is about 4555.8719253289. The cubic root of 20755969 is about 274.8195797285.

The spelling of 20755969 in words is "twenty million, seven hundred fifty-five thousand, nine hundred sixty-nine".