20975345 has 8 divisors (see below), whose sum is σ = 25474176. Its totient is φ = 16577776.

The previous prime is 20975341. The next prime is 20975347. The reversal of 20975345 is 54357902.

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 20975345 - 2² = 20975341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20975341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24857 + ... + 25686.

It is an arithmetic number, because the mean of its divisors is an integer number (3184272).

Almost surely, 2^20975345 is an apocalyptic number.

It is an amenable number.

20975345 is a deficient number, since it is larger than the sum of its proper divisors (4498831).

20975345 is an equidigital number, since it uses as much as digits as its factorization.

20975345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50631.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20975345 is about 4579.8848238793. The cubic root of 20975345 is about 275.7844050778.

The spelling of 20975345 in words is "twenty million, nine hundred seventy-five thousand, three hundred forty-five".