20409195 has 8 divisors (see below), whose sum is σ = 32654736. Its totient is φ = 10884896.

The previous prime is 20409157. The next prime is 20409199. The reversal of 20409195 is 59190402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20409195 - 2⁶ = 20409131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20409199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680292 + ... + 680321.

It is an arithmetic number, because the mean of its divisors is an integer number (4081842).

Almost surely, 2^20409195 is an apocalyptic number.

20409195 is a deficient number, since it is larger than the sum of its proper divisors (12245541).

20409195 is a wasteful number, since it uses less digits than its factorization.

20409195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360621.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20409195 is about 4517.6537051881. The cubic root of 20409195 is about 273.2804883297.

Adding to 20409195 its reverse (59190402), we get a palindrome (79599597).

The spelling of 20409195 in words is "twenty million, four hundred nine thousand, one hundred ninety-five".