26686820 has 12 divisors (see below), whose sum is σ = 56042364. Its totient is φ = 10674720.

The previous prime is 26686819. The next prime is 26686823. The reversal of 26686820 is 2868662.

It can be written as a sum of positive squares in 2 ways, for example, as 18438436 + 8248384 = 4294^2 + 2872^2 .

It is not an unprimeable number, because it can be changed into a prime (26686823) 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 3 ways as a sum of consecutive naturals, for example, 667151 + ... + 667190.

It is an arithmetic number, because the mean of its divisors is an integer number (4670197).

Almost surely, 2^26686820 is an apocalyptic number.

26686820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26686820 is an abundant number, since it is smaller than the sum of its proper divisors (29355544).

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

26686820 is a wasteful number, since it uses less digits than its factorization.

26686820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334350 (or 1334348 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 26686820 is about 5165.9287645108. The cubic root of 26686820 is about 298.8355601882.

The spelling of 26686820 in words is "twenty-six million, six hundred eighty-six thousand, eight hundred twenty".