26161820 has 12 divisors (see below), whose sum is σ = 54939864. Its totient is φ = 10464720.

The previous prime is 26161801. The next prime is 26161823. The reversal of 26161820 is 2816162.

It is a self number, because there is not a number n which added to its sum of digits gives 26161820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26161823) 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, 654026 + ... + 654065.

It is an arithmetic number, because the mean of its divisors is an integer number (4578322).

Almost surely, 2^26161820 is an apocalyptic number.

26161820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26161820 is an abundant number, since it is smaller than the sum of its proper divisors (28778044).

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

26161820 is a wasteful number, since it uses less digits than its factorization.

26161820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308100 (or 1308098 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 26161820 is about 5114.8626570026. The cubic root of 26161820 is about 296.8629401565.

Adding to 26161820 its reverse (2816162), we get a palindrome (28977982).

The spelling of 26161820 in words is "twenty-six million, one hundred sixty-one thousand, eight hundred twenty".