20866469 has 8 divisors (see below), whose sum is σ = 22519392. Its totient is φ = 19220400.

The previous prime is 20866421. The next prime is 20866493. The reversal of 20866469 is 96466802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20866469 is a prime.

It is a super-2 number, since 2×20866469² = 870819057055922, 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 (20866169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5894 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (2814924).

Almost surely, 2^20866469 is an apocalyptic number.

It is an amenable number.

20866469 is a deficient number, since it is larger than the sum of its proper divisors (1652923).

20866469 is a wasteful number, since it uses less digits than its factorization.

20866469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 20866469 is about 4567.9830341191. The cubic root of 20866469 is about 275.3064088813.

The spelling of 20866469 in words is "twenty million, eight hundred sixty-six thousand, four hundred sixty-nine".