20885567 has 4 divisors (see below), whose sum is σ = 20901000. Its totient is φ = 20870136.

The previous prime is 20885563. The next prime is 20885569. The reversal of 20885567 is 76558802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20885567 - 2² = 20885563 is a prime.

It is a super-2 number, since 2×20885567² = 872413817822978, 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 (20885561) 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, 5468 + ... + 8465.

It is an arithmetic number, because the mean of its divisors is an integer number (5225250).

Almost surely, 2^20885567 is an apocalyptic number.

20885567 is a deficient number, since it is larger than the sum of its proper divisors (15433).

20885567 is a wasteful number, since it uses less digits than its factorization.

20885567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15432.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 20885567 is about 4570.0729753473. The cubic root of 20885567 is about 275.3903745097.

The spelling of 20885567 in words is "twenty million, eight hundred eighty-five thousand, five hundred sixty-seven".