20148971 has 4 divisors (see below), whose sum is σ = 20479344. Its totient is φ = 19818600.

The previous prime is 20148967. The next prime is 20149009. The reversal of 20148971 is 17984102.

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 20148971 - 2² = 20148967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20148901) 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, 165095 + ... + 165216.

It is an arithmetic number, because the mean of its divisors is an integer number (5119836).

Almost surely, 2^20148971 is an apocalyptic number.

20148971 is a deficient number, since it is larger than the sum of its proper divisors (330373).

20148971 is an equidigital number, since it uses as much as digits as its factorization.

20148971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330372.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 20148971 is about 4488.7605193416. The cubic root of 20148971 is about 272.1140444128.

The spelling of 20148971 in words is "twenty million, one hundred forty-eight thousand, nine hundred seventy-one".