20147047 has 4 divisors (see below), whose sum is σ = 20267856. Its totient is φ = 20026240.

The previous prime is 20147033. The next prime is 20147059. The reversal of 20147047 is 74074102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20147047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147147) 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, 60154 + ... + 60487.

It is an arithmetic number, because the mean of its divisors is an integer number (5066964).

Almost surely, 2^20147047 is an apocalyptic number.

20147047 is a deficient number, since it is larger than the sum of its proper divisors (120809).

20147047 is a wasteful number, since it uses less digits than its factorization.

20147047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120808.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20147047 is about 4488.5462011658. The cubic root of 20147047 is about 272.1053828607.

The spelling of 20147047 in words is "twenty million, one hundred forty-seven thousand, forty-seven".