20471823 has 12 divisors (see below), whose sum is σ = 29945760. Its totient is φ = 13474656.

The previous prime is 20471821. The next prime is 20471881. The reversal of 20471823 is 32817402.

It is not a de Polignac number, because 20471823 - 2¹ = 20471821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13686 + ... + 15107.

It is an arithmetic number, because the mean of its divisors is an integer number (2495480).

Almost surely, 2^20471823 is an apocalyptic number.

20471823 is a deficient number, since it is larger than the sum of its proper divisors (9473937).

20471823 is a wasteful number, since it uses less digits than its factorization.

20471823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28878 (or 28875 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20471823 is about 4524.5798699990. The cubic root of 20471823 is about 273.5597339301.

It can be divided in two parts, 204 and 71823, that added together give a palindrome (72027).

The spelling of 20471823 in words is "twenty million, four hundred seventy-one thousand, eight hundred twenty-three".