20955149 has 4 divisors (see below), whose sum is σ = 20967036. Its totient is φ = 20943264.

The previous prime is 20955133. The next prime is 20955167. The reversal of 20955149 is 94155902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9517225 + 11437924 = 3085^2 + 3382^2 .

It is a cyclic number.

It is not a de Polignac number, because 20955149 - 2⁴ = 20955133 is a prime.

It is a super-2 number, since 2×20955149² = 878236539224402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2714 + ... + 7019.

It is an arithmetic number, because the mean of its divisors is an integer number (5241759).

Almost surely, 2^20955149 is an apocalyptic number.

It is an amenable number.

20955149 is a deficient number, since it is larger than the sum of its proper divisors (11887).

20955149 is an equidigital number, since it uses as much as digits as its factorization.

20955149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11886.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 20955149 is about 4577.6794339490. The cubic root of 20955149 is about 275.6958641360.

The spelling of 20955149 in words is "twenty million, nine hundred fifty-five thousand, one hundred forty-nine".