20238147 has 16 divisors (see below), whose sum is σ = 30120480. Its totient is φ = 13430016.

The previous prime is 20238131. The next prime is 20238151. The reversal of 20238147 is 74183202.

It is not a de Polignac number, because 20238147 - 2⁴ = 20238131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20238147.

It is not an unprimeable number, because it can be changed into a prime (20238047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4683 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (1882530).

Almost surely, 2^20238147 is an apocalyptic number.

20238147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20238147 is a deficient number, since it is larger than the sum of its proper divisors (9882333).

20238147 is a wasteful number, since it uses less digits than its factorization.

20238147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459 (or 3453 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20238147 is about 4498.6828072226. The cubic root of 20238147 is about 272.5148974825.

The spelling of 20238147 in words is "twenty million, two hundred thirty-eight thousand, one hundred forty-seven".