20181147 has 16 divisors (see below), whose sum is σ = 31468800. Its totient is φ = 11263392.

The previous prime is 20181131. The next prime is 20181149. The reversal of 20181147 is 74118102.

It is not a de Polignac number, because 20181147 - 2⁴ = 20181131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20181149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10272 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (1966800).

Almost surely, 2^20181147 is an apocalyptic number.

20181147 is a deficient number, since it is larger than the sum of its proper divisors (11287653).

20181147 is a wasteful number, since it uses less digits than its factorization.

20181147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22402.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 20181147 is about 4492.3431525207. The cubic root of 20181147 is about 272.2588141719.

Adding to 20181147 its reverse (74118102), we get a palindrome (94299249).

The spelling of 20181147 in words is "twenty million, one hundred eighty-one thousand, one hundred forty-seven".