20825091 has 12 divisors (see below), whose sum is σ = 34378032. Its totient is φ = 11900016.

The previous prime is 20825071. The next prime is 20825093. The reversal of 20825091 is 19052802.

It is not a de Polignac number, because 20825091 - 2⁹ = 20824579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20825093) 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 11 ways as a sum of consecutive naturals, for example, 165216 + ... + 165341.

It is an arithmetic number, because the mean of its divisors is an integer number (2864836).

Almost surely, 2^20825091 is an apocalyptic number.

20825091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20825091 is a deficient number, since it is larger than the sum of its proper divisors (13552941).

20825091 is a wasteful number, since it uses less digits than its factorization.

20825091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330570 (or 330567 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20825091 is about 4563.4516541758. The cubic root of 20825091 is about 275.1243118413.

Adding to 20825091 its reverse (19052802), we get a palindrome (39877893).

The spelling of 20825091 in words is "twenty million, eight hundred twenty-five thousand, ninety-one".