20409146 has 8 divisors (see below), whose sum is σ = 32414580. Its totient is φ = 9604288.

The previous prime is 20409131. The next prime is 20409149. The reversal of 20409146 is 64190402.

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 60025 = 4511^2 + 245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20409149) 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, 300101 + ... + 300168.

Almost surely, 2^20409146 is an apocalyptic number.

20409146 is a deficient number, since it is larger than the sum of its proper divisors (12005434).

20409146 is a wasteful number, since it uses less digits than its factorization.

20409146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600288.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20409146 is about 4517.6482820158. The cubic root of 20409146 is about 273.2802696251.

Adding to 20409146 its reverse (64190402), we get a palindrome (84599548).

The spelling of 20409146 in words is "twenty million, four hundred nine thousand, one hundred forty-six".