20216471 has 8 divisors (see below), whose sum is σ = 23013504. Its totient is φ = 17579320.

The previous prime is 20216447. The next prime is 20216477. The reversal of 20216471 is 17461202.

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

It is not a de Polignac number, because 20216471 - 2¹⁴ = 20200087 is a prime.

It is a super-3 number, since 3×20216471³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216477) 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, 39701 + ... + 40206.

It is an arithmetic number, because the mean of its divisors is an integer number (2876688).

Almost surely, 2^20216471 is an apocalyptic number.

20216471 is a deficient number, since it is larger than the sum of its proper divisors (2797033).

20216471 is a wasteful number, since it uses less digits than its factorization.

20216471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79941.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20216471 is about 4496.2730121735. The cubic root of 20216471 is about 272.4175706690.

Adding to 20216471 its reverse (17461202), we get a palindrome (37677673).

The spelling of 20216471 in words is "twenty million, two hundred sixteen thousand, four hundred seventy-one".