20893669 has 4 divisors (see below), whose sum is σ = 20905344. Its totient is φ = 20881996.

The previous prime is 20893651. The next prime is 20893679. The reversal of 20893669 is 96639802.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20893669 - 2⁹ = 20893157 is a prime.

It is a super-2 number, since 2×20893669² = 873090808563122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20893679) 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, 2527 + ... + 6940.

It is an arithmetic number, because the mean of its divisors is an integer number (5226336).

Almost surely, 2^20893669 is an apocalyptic number.

It is an amenable number.

20893669 is a deficient number, since it is larger than the sum of its proper divisors (11675).

20893669 is an equidigital number, since it uses as much as digits as its factorization.

20893669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11674.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20893669 is about 4570.9593085041. The cubic root of 20893669 is about 275.4259800288.

The spelling of 20893669 in words is "twenty million, eight hundred ninety-three thousand, six hundred sixty-nine".