20269161 has 24 divisors (see below), whose sum is σ = 32550336. Its totient is φ = 12049440.

The previous prime is 20269159. The next prime is 20269169. The reversal of 20269161 is 16196202.

It is not a de Polignac number, because 20269161 - 2¹ = 20269159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20269169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3316 + ... + 7178.

It is an arithmetic number, because the mean of its divisors is an integer number (1356264).

Almost surely, 2^20269161 is an apocalyptic number.

It is an amenable number.

20269161 is a deficient number, since it is larger than the sum of its proper divisors (12281175).

20269161 is a wasteful number, since it uses less digits than its factorization.

20269161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933 (or 3930 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20269161 is about 4502.1284966114. The cubic root of 20269161 is about 272.6540318178.

The spelling of 20269161 in words is "twenty million, two hundred sixty-nine thousand, one hundred sixty-one".