20668575 has 12 divisors (see below), whose sum is σ = 34172168. Its totient is φ = 11023200.

The previous prime is 20668573. The next prime is 20668589. The reversal of 20668575 is 57586602.

It is a happy number.

It is not a de Polignac number, because 20668575 - 2¹ = 20668573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137716 + ... + 137865.

Almost surely, 2^20668575 is an apocalyptic number.

20668575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20668575 is a deficient number, since it is larger than the sum of its proper divisors (13503593).

20668575 is a wasteful number, since it uses less digits than its factorization.

20668575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275594 (or 275589 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 20668575 is about 4546.2704495003. The cubic root of 20668575 is about 274.4333234427.

The spelling of 20668575 in words is "twenty million, six hundred sixty-eight thousand, five hundred seventy-five".