20432447 has 4 divisors (see below), whose sum is σ = 23351376. Its totient is φ = 17513520.

The previous prime is 20432437. The next prime is 20432449. The reversal of 20432447 is 74423402.

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 20432447 - 2⁶ = 20432383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432449) 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, 1459454 + ... + 1459467.

It is an arithmetic number, because the mean of its divisors is an integer number (5837844).

Almost surely, 2^20432447 is an apocalyptic number.

20432447 is a deficient number, since it is larger than the sum of its proper divisors (2918929).

20432447 is an equidigital number, since it uses as much as digits as its factorization.

20432447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918928.

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 20432447 is about 4520.2264323815. The cubic root of 20432447 is about 273.3842308879.

Adding to 20432447 its reverse (74423402), we get a palindrome (94855849).

The spelling of 20432447 in words is "twenty million, four hundred thirty-two thousand, four hundred forty-seven".