20109406 has 24 divisors (see below), whose sum is σ = 32051880. Its totient is φ = 9460176.

The previous prime is 20109379. The next prime is 20109413. The reversal of 20109406 is 60490102.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 87700 + ... + 87928.

It is an arithmetic number, because the mean of its divisors is an integer number (1335495).

Almost surely, 2^20109406 is an apocalyptic number.

20109406 is a deficient number, since it is larger than the sum of its proper divisors (11942474).

20109406 is a wasteful number, since it uses less digits than its factorization.

20109406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20109406 is about 4484.3512351287. The cubic root of 20109406 is about 271.9358178294.

Adding to 20109406 its reverse (60490102), we get a palindrome (80599508).

The spelling of 20109406 in words is "twenty million, one hundred nine thousand, four hundred six".