20469355 has 4 divisors (see below), whose sum is σ = 24563232. Its totient is φ = 16375480.

The previous prime is 20469353. The next prime is 20469359. The reversal of 20469355 is 55396402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20469355 - 2¹ = 20469353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20469355.

It is not an unprimeable number, because it can be changed into a prime (20469353) 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, 2046931 + ... + 2046940.

It is an arithmetic number, because the mean of its divisors is an integer number (6140808).

Almost surely, 2^20469355 is an apocalyptic number.

20469355 is a deficient number, since it is larger than the sum of its proper divisors (4093877).

20469355 is an equidigital number, since it uses as much as digits as its factorization.

20469355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093876.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20469355 is about 4524.3071292741. The cubic root of 20469355 is about 273.5487404041.

The spelling of 20469355 in words is "twenty million, four hundred sixty-nine thousand, three hundred fifty-five".