20108147 has 4 divisors (see below), whose sum is σ = 20487600. Its totient is φ = 19728696.

The previous prime is 20108129. The next prime is 20108149. The reversal of 20108147 is 74180102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74180102 = 2 ⋅37090051.

It is a cyclic number.

It is not a de Polignac number, because 20108147 - 2⁶ = 20108083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20108149) 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, 189647 + ... + 189752.

It is an arithmetic number, because the mean of its divisors is an integer number (5121900).

Almost surely, 2^20108147 is an apocalyptic number.

20108147 is a deficient number, since it is larger than the sum of its proper divisors (379453).

20108147 is an equidigital number, since it uses as much as digits as its factorization.

20108147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379452.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20108147 is about 4484.2108558809. The cubic root of 20108147 is about 271.9301426354.

Adding to 20108147 its reverse (74180102), we get a palindrome (94288249).

The spelling of 20108147 in words is "twenty million, one hundred eight thousand, one hundred forty-seven".