20463909 has 4 divisors (see below), whose sum is σ = 27285216. Its totient is φ = 13642604.

The previous prime is 20463907. The next prime is 20463953. The reversal of 20463909 is 90936402.

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 20463909 - 2¹ = 20463907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20463909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20463901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3410649 + ... + 3410654.

It is an arithmetic number, because the mean of its divisors is an integer number (6821304).

Almost surely, 2^20463909 is an apocalyptic number.

It is an amenable number.

20463909 is a deficient number, since it is larger than the sum of its proper divisors (6821307).

20463909 is an equidigital number, since it uses as much as digits as its factorization.

20463909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821306.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20463909 is about 4523.7052291236. The cubic root of 20463909 is about 273.5244784675.

The spelling of 20463909 in words is "twenty million, four hundred sixty-three thousand, nine hundred nine".