20675661 has 4 divisors (see below), whose sum is σ = 27567552. Its totient is φ = 13783772.

The previous prime is 20675653. The next prime is 20675663. The reversal of 20675661 is 16657602.

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 20675661 - 2³ = 20675653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3445941 + ... + 3445946.

It is an arithmetic number, because the mean of its divisors is an integer number (6891888).

Almost surely, 2^20675661 is an apocalyptic number.

It is an amenable number.

20675661 is a deficient number, since it is larger than the sum of its proper divisors (6891891).

20675661 is an equidigital number, since it uses as much as digits as its factorization.

20675661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891890.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20675661 is about 4547.0497028293. The cubic root of 20675661 is about 274.4646820364.

The spelling of 20675661 in words is "twenty million, six hundred seventy-five thousand, six hundred sixty-one".