20825911 has 8 divisors (see below), whose sum is σ = 21178800. Its totient is φ = 20475840.

The previous prime is 20825891. The next prime is 20825921. The reversal of 20825911 is 11952802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20825911 - 2¹⁹ = 20301623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20825911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20825921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18225 + ... + 19333.

It is an arithmetic number, because the mean of its divisors is an integer number (2647350).

Almost surely, 2^20825911 is an apocalyptic number.

20825911 is a deficient number, since it is larger than the sum of its proper divisors (352889).

20825911 is a wasteful number, since it uses less digits than its factorization.

20825911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20825911 is about 4563.5414975652. The cubic root of 20825911 is about 275.1279228535.

It can be divided in two parts, 20825 and 911, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 20825911 in words is "twenty million, eight hundred twenty-five thousand, nine hundred eleven".