20216235 has 32 divisors (see below), whose sum is σ = 35659008. Its totient is φ = 9717120.

The previous prime is 20216221. The next prime is 20216237. The reversal of 20216235 is 53261202.

It is not a de Polignac number, because 20216235 - 2¹⁰ = 20215211 is a prime.

It is a super-3 number, since 3×20216235³ (a number of 23 digits) contains 333 as substring.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20216237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7180 + ... + 9590.

It is an arithmetic number, because the mean of its divisors is an integer number (1114344).

Almost surely, 2^20216235 is an apocalyptic number.

20216235 is a deficient number, since it is larger than the sum of its proper divisors (15442773).

20216235 is a wasteful number, since it uses less digits than its factorization.

20216235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20216235 is about 4496.2467681390. The cubic root of 20216235 is about 272.4165106292.

Adding to 20216235 its reverse (53261202), we get a palindrome (73477437).

It can be divided in two parts, 2021 and 6235, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 20216235 in words is "twenty million, two hundred sixteen thousand, two hundred thirty-five".