20266881 has 8 divisors (see below), whose sum is σ = 27043584. Its totient is φ = 13500720.

The previous prime is 20266877. The next prime is 20266927. The reversal of 20266881 is 18866202.

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

It is not a de Polignac number, because 20266881 - 2² = 20266877 is a prime.

It is a super-2 number, since 2×20266881² = 821492930936322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20266871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5091 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (3380448).

Almost surely, 2^20266881 is an apocalyptic number.

It is an amenable number.

20266881 is a deficient number, since it is larger than the sum of its proper divisors (6776703).

20266881 is a wasteful number, since it uses less digits than its factorization.

20266881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20266881 is about 4501.8752759267. The cubic root of 20266881 is about 272.6438081665.

The spelling of 20266881 in words is "twenty million, two hundred sixty-six thousand, eight hundred eighty-one".