20415206 has 8 divisors (see below), whose sum is σ = 34997520. Its totient is φ = 8749368.

The previous prime is 20415203. The next prime is 20415221. The reversal of 20415206 is 60251402.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415203) 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, 729101 + ... + 729128.

It is an arithmetic number, because the mean of its divisors is an integer number (4374690).

Almost surely, 2^20415206 is an apocalyptic number.

20415206 is a deficient number, since it is larger than the sum of its proper divisors (14582314).

20415206 is a wasteful number, since it uses less digits than its factorization.

20415206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458238.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20415206 is about 4518.3189351793. The cubic root of 20415206 is about 273.3073149271.

Adding to 20415206 its reverse (60251402), we get a palindrome (80666608).

The spelling of 20415206 in words is "twenty million, four hundred fifteen thousand, two hundred six".