20409416 has 8 divisors (see below), whose sum is σ = 38267670. Its totient is φ = 10204704.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409416 is 61490402.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 1833316 = 4310^2 + 1354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20409416² = 833088522922112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275581 + ... + 1275596.

Almost surely, 2^20409416 is an apocalyptic number.

It is an amenable number.

20409416 is a deficient number, since it is larger than the sum of its proper divisors (17858254).

20409416 is a wasteful number, since it uses less digits than its factorization.

20409416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551183 (or 2551179 counting only the distinct ones).

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

The square root of 20409416 is about 4517.6781647213. The cubic root of 20409416 is about 273.2814747277.

Adding to 20409416 its reverse (61490402), we get a palindrome (81899818).

The spelling of 20409416 in words is "twenty million, four hundred nine thousand, four hundred sixteen".