20169149 has 16 divisors (see below), whose sum is σ = 27081600. Its totient is φ = 14506560.

The previous prime is 20169143. The next prime is 20169169. The reversal of 20169149 is 94196102.

It is a cyclic number.

It is not a de Polignac number, because 20169149 - 2⁴ = 20169133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9074 + ... + 11075.

It is an arithmetic number, because the mean of its divisors is an integer number (1692600).

Almost surely, 2^20169149 is an apocalyptic number.

It is an amenable number.

20169149 is a deficient number, since it is larger than the sum of its proper divisors (6912451).

20169149 is a wasteful number, since it uses less digits than its factorization.

20169149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20180.

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

The square root of 20169149 is about 4491.0075706906. The cubic root of 20169149 is about 272.2048494690.

The spelling of 20169149 in words is "twenty million, one hundred sixty-nine thousand, one hundred forty-nine".