20961149 has 8 divisors (see below), whose sum is σ = 23157120. Its totient is φ = 18813600.

The previous prime is 20961139. The next prime is 20961163. The reversal of 20961149 is 94116902.

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 20961149 - 2⁴ = 20961133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11192 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (2894640).

Almost surely, 2^20961149 is an apocalyptic number.

It is an amenable number.

20961149 is a deficient number, since it is larger than the sum of its proper divisors (2195971).

20961149 is a wasteful number, since it uses less digits than its factorization.

20961149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24211.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20961149 is about 4578.3347409293. The cubic root of 20961149 is about 275.7221745722.

It can be divided in two parts, 20 and 961149, that added together give a palindrome (961169).

The spelling of 20961149 in words is "twenty million, nine hundred sixty-one thousand, one hundred forty-nine".