20476147 has 4 divisors (see below), whose sum is σ = 20541880. Its totient is φ = 20410416.

The previous prime is 20476139. The next prime is 20476153. The reversal of 20476147 is 74167402.

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

It is a cyclic number.

It is not a de Polignac number, because 20476147 - 2³ = 20476139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20476447) 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 3 ways as a sum of consecutive naturals, for example, 32397 + ... + 33022.

It is an arithmetic number, because the mean of its divisors is an integer number (5135470).

Almost surely, 2^20476147 is an apocalyptic number.

20476147 is a deficient number, since it is larger than the sum of its proper divisors (65733).

20476147 is an equidigital number, since it uses as much as digits as its factorization.

20476147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65732.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20476147 is about 4525.0576791904. The cubic root of 20476147 is about 273.5789927429.

The spelling of 20476147 in words is "twenty million, four hundred seventy-six thousand, one hundred forty-seven".