20675321 has 4 divisors (see below), whose sum is σ = 21574272. Its totient is φ = 19776372.

The previous prime is 20675309. The next prime is 20675351. The reversal of 20675321 is 12357602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20675321 - 2¹⁸ = 20413177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20675351) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 449441 + ... + 449486.

It is an arithmetic number, because the mean of its divisors is an integer number (5393568).

Almost surely, 2^20675321 is an apocalyptic number.

It is an amenable number.

20675321 is a deficient number, since it is larger than the sum of its proper divisors (898951).

20675321 is an equidigital number, since it uses as much as digits as its factorization.

20675321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898950.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20675321 is about 4547.0123157959. The cubic root of 20675321 is about 274.4631775540.

The spelling of 20675321 in words is "twenty million, six hundred seventy-five thousand, three hundred twenty-one".