20269405 has 16 divisors (see below), whose sum is σ = 27100080. Its totient is φ = 14450688.

The previous prime is 20269349. The next prime is 20269421. The reversal of 20269405 is 50496202.

It can be written as a sum of positive squares in 8 ways, for example, as 10404 + 20259001 = 102^2 + 4501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20269405 - 2⁹ = 20268893 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3492 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (1693755).

Almost surely, 2^20269405 is an apocalyptic number.

It is an amenable number.

20269405 is a deficient number, since it is larger than the sum of its proper divisors (6830675).

20269405 is a wasteful number, since it uses less digits than its factorization.

20269405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20269405 is about 4502.1555948234. The cubic root of 20269405 is about 272.6551258824.

The spelling of 20269405 in words is "twenty million, two hundred sixty-nine thousand, four hundred five".