20975965 has 8 divisors (see below), whose sum is σ = 25454520. Its totient is φ = 16591872.

The previous prime is 20975939. The next prime is 20975971. The reversal of 20975965 is 56957902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1004004 + 19971961 = 1002^2 + 4469^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20975965 - 2⁷ = 20975837 is a prime.

It is a super-2 number, since 2×20975965² = 879982215362450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23124 + ... + 24013.

It is an arithmetic number, because the mean of its divisors is an integer number (3181815).

Almost surely, 2^20975965 is an apocalyptic number.

It is an amenable number.

20975965 is a deficient number, since it is larger than the sum of its proper divisors (4478555).

20975965 is an equidigital number, since it uses as much as digits as its factorization.

20975965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47231.

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

The square root of 20975965 is about 4579.9525106708. The cubic root of 20975965 is about 275.7871223099.

The spelling of 20975965 in words is "twenty million, nine hundred seventy-five thousand, nine hundred sixty-five".