20147123 has 4 divisors (see below), whose sum is σ = 20156760. Its totient is φ = 20137488.

The previous prime is 20147111. The next prime is 20147131. The reversal of 20147123 is 32174102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20147123 - 2⁴ = 20147107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20147095 and 20147104.

It is not an unprimeable number, because it can be changed into a prime (20147423) 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, 218 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (5039190).

Almost surely, 2^20147123 is an apocalyptic number.

20147123 is a deficient number, since it is larger than the sum of its proper divisors (9637).

20147123 is an equidigital number, since it uses as much as digits as its factorization.

20147123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9636.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20147123 is about 4488.5546671507. The cubic root of 20147123 is about 272.1057250115.

The spelling of 20147123 in words is "twenty million, one hundred forty-seven thousand, one hundred twenty-three".