20801149 has 8 divisors (see below), whose sum is σ = 22784760. Its totient is φ = 18902016.

The previous prime is 20801117. The next prime is 20801167. The reversal of 20801149 is 94110802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6285049 + 14516100 = 2507^2 + 3810^2 .

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 20801149 - 2⁵ = 20801117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801749) 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, 20604 + ... + 21589.

It is an arithmetic number, because the mean of its divisors is an integer number (2848095).

Almost surely, 2^20801149 is an apocalyptic number.

20801149 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20801149 is a deficient number, since it is larger than the sum of its proper divisors (1983611).

20801149 is a wasteful number, since it uses less digits than its factorization.

20801149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42239.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20801149 is about 4560.8276661150. The cubic root of 20801149 is about 275.0188372771.

The spelling of 20801149 in words is "twenty million, eight hundred one thousand, one hundred forty-nine".