20472971 has 2 divisors, whose sum is σ = 20472972. Its totient is φ = 20472970.

The previous prime is 20472943. The next prime is 20472973. The reversal of 20472971 is 17927402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20472971 - 2¹⁴ = 20456587 is a prime.

It is a super-4 number, since 4×20472971⁴ (a number of 30 digits) contains 4444 as substring.

Together with 20472973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20472973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236485 + 10236486.

It is an arithmetic number, because the mean of its divisors is an integer number (10236486).

Almost surely, 2^20472971 is an apocalyptic number.

20472971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472971 is an equidigital number, since it uses as much as digits as its factorization.

20472971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20472971 is about 4524.7067308280. The cubic root of 20472971 is about 273.5648473113.

The spelling of 20472971 in words is "twenty million, four hundred seventy-two thousand, nine hundred seventy-one".