20419505 has 4 divisors (see below), whose sum is σ = 24503412. Its totient is φ = 16335600.

The previous prime is 20419501. The next prime is 20419519. The reversal of 20419505 is 50591402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2972176 + 17447329 = 1724^2 + 4177^2 .

It is not a de Polignac number, because 20419505 - 2² = 20419501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20419501) 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, 2041946 + ... + 2041955.

It is an arithmetic number, because the mean of its divisors is an integer number (6125853).

Almost surely, 2^20419505 is an apocalyptic number.

It is an amenable number.

20419505 is a deficient number, since it is larger than the sum of its proper divisors (4083907).

20419505 is an equidigital number, since it uses as much as digits as its factorization.

20419505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083906.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20419505 is about 4518.7946401668. The cubic root of 20419505 is about 273.3264977800.

The spelling of 20419505 in words is "twenty million, four hundred nineteen thousand, five hundred five".