20409415 has 8 divisors (see below), whose sum is σ = 26375328. Its totient is φ = 15071520.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409415 is 51490402.

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

It is not a de Polignac number, because 20409415 - 2⁵ = 20409383 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 20409415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156931 + ... + 157060.

It is an arithmetic number, because the mean of its divisors is an integer number (3296916).

Almost surely, 2^20409415 is an apocalyptic number.

20409415 is a deficient number, since it is larger than the sum of its proper divisors (5965913).

20409415 is a wasteful number, since it uses less digits than its factorization.

20409415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314009.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20409415 is about 4517.6780540450. The cubic root of 20409415 is about 273.2814702644.

Adding to 20409415 its reverse (51490402), we get a palindrome (71899817).

The spelling of 20409415 in words is "twenty million, four hundred nine thousand, four hundred fifteen".