266841920 has 56 divisors (see below), whose sum is σ = 636888744. Its totient is φ = 106489856.

The previous prime is 266841917. The next prime is 266841943. The reversal of 266841920 is 29148662.

It can be written as a sum of positive squares in 4 ways, for example, as 17707264 + 249134656 = 4208^2 + 15784^2 .

It is a super-2 number, since 2×266841920² = 142409220538572800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208322 + ... + 209598.

Almost surely, 2^266841920 is an apocalyptic number.

266841920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266841920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318444372).

266841920 is an abundant number, since it is smaller than the sum of its proper divisors (370046824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266841920 is a wasteful number, since it uses less digits than its factorization.

266841920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 266841920 is about 16335.2967527376. The cubic root of 266841920 is about 643.8005632198.

The spelling of 266841920 in words is "two hundred sixty-six million, eight hundred forty-one thousand, nine hundred twenty".