20269909 has 4 divisors (see below), whose sum is σ = 22112640. Its totient is φ = 18427180.

The previous prime is 20269901. The next prime is 20269919. The reversal of 20269909 is 90996202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20269909 - 2³ = 20269901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921349 + ... + 921370.

It is an arithmetic number, because the mean of its divisors is an integer number (5528160).

Almost surely, 2^20269909 is an apocalyptic number.

It is an amenable number.

20269909 is a deficient number, since it is larger than the sum of its proper divisors (1842731).

20269909 is a wasteful number, since it uses less digits than its factorization.

20269909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842730.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 20269909 is about 4502.2115676632. The cubic root of 20269909 is about 272.6573857258.

It can be divided in two parts, 2026 and 9909, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 20269909 in words is "twenty million, two hundred sixty-nine thousand, nine hundred nine".