20408147 has 4 divisors (see below), whose sum is σ = 21482280. Its totient is φ = 19334016.

The previous prime is 20408117. The next prime is 20408189. The reversal of 20408147 is 74180402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74180402 = 2 ⋅37090201.

It is a cyclic number.

It is not a de Polignac number, because 20408147 - 2¹⁶ = 20342611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20408117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537038 + ... + 537075.

It is an arithmetic number, because the mean of its divisors is an integer number (5370570).

Almost surely, 2^20408147 is an apocalyptic number.

20408147 is a deficient number, since it is larger than the sum of its proper divisors (1074133).

20408147 is a wasteful number, since it uses less digits than its factorization.

20408147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074132.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20408147 is about 4517.5377142864. The cubic root of 20408147 is about 273.2758106529.

Adding to 20408147 its reverse (74180402), we get a palindrome (94588549).

The spelling of 20408147 in words is "twenty million, four hundred eight thousand, one hundred forty-seven".