20432217 has 8 divisors (see below), whose sum is σ = 29338624. Its totient is φ = 12573648.

The previous prime is 20432183. The next prime is 20432233. The reversal of 20432217 is 71223402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20432217 - 2¹⁹ = 19907929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20432193 and 20432202.

It is not an unprimeable number, because it can be changed into a prime (20432287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261913 + ... + 261990.

It is an arithmetic number, because the mean of its divisors is an integer number (3667328).

Almost surely, 2^20432217 is an apocalyptic number.

It is an amenable number.

20432217 is a deficient number, since it is larger than the sum of its proper divisors (8906407).

20432217 is a wasteful number, since it uses less digits than its factorization.

20432217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523919.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20432217 is about 4520.2009911065. The cubic root of 20432217 is about 273.3832050913.

Adding to 20432217 its reverse (71223402), we get a palindrome (91655619).

The spelling of 20432217 in words is "twenty million, four hundred thirty-two thousand, two hundred seventeen".