20266685 has 8 divisors (see below), whose sum is σ = 24344376. Its totient is φ = 16197120.

The previous prime is 20266681. The next prime is 20266693. The reversal of 20266685 is 58666202.

It can be written as a sum of positive squares in 4 ways, for example, as 2735716 + 17530969 = 1654^2 + 4187^2 .

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

It is not a de Polignac number, because 20266685 - 2² = 20266681 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 (20266681) 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, 7745 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (3043047).

Almost surely, 2^20266685 is an apocalyptic number.

It is an amenable number.

20266685 is a deficient number, since it is larger than the sum of its proper divisors (4077691).

20266685 is a wasteful number, since it uses less digits than its factorization.

20266685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20266685 is about 4501.8535071679. The cubic root of 20266685 is about 272.6429292554.

The spelling of 20266685 in words is "twenty million, two hundred sixty-six thousand, six hundred eighty-five".