26191920 has 40 divisors (see below), whose sum is σ = 81195696. Its totient is φ = 6984448.

The previous prime is 26191903. The next prime is 26191927. The reversal of 26191920 is 2919162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (26191927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54327 + ... + 54806.

Almost surely, 2^26191920 is an apocalyptic number.

26191920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26191920 is an abundant number, since it is smaller than the sum of its proper divisors (55003776).

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

26191920 is a wasteful number, since it uses less digits than its factorization.

26191920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109149 (or 109143 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 26191920 is about 5117.8042166539. The cubic root of 26191920 is about 296.9767465838.

The spelling of 26191920 in words is "twenty-six million, one hundred ninety-one thousand, nine hundred twenty".