20473771 has 4 divisors (see below), whose sum is σ = 20499472. Its totient is φ = 20448072.

The previous prime is 20473769. The next prime is 20473777. The reversal of 20473771 is 17737402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17737402 = 2 ⋅8868701.

It is a cyclic number.

It is not a de Polignac number, because 20473771 - 2¹ = 20473769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20473777) 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, 11616 + ... + 13261.

It is an arithmetic number, because the mean of its divisors is an integer number (5124868).

Almost surely, 2^20473771 is an apocalyptic number.

20473771 is a deficient number, since it is larger than the sum of its proper divisors (25701).

20473771 is an equidigital number, since it uses as much as digits as its factorization.

20473771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25700.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 20473771 is about 4524.7951334839. The cubic root of 20473771 is about 273.5684105302.

The spelling of 20473771 in words is "twenty million, four hundred seventy-three thousand, seven hundred seventy-one".