20216031 has 16 divisors (see below), whose sum is σ = 29607168. Its totient is φ = 12168000.

The previous prime is 20216017. The next prime is 20216033. The reversal of 20216031 is 13061202.

It is not a de Polignac number, because 20216031 - 2⁶ = 20215967 is a prime.

It is a super-2 number, since 2×20216031² = 817375818785922, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20216031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2955 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (1850448).

Almost surely, 2^20216031 is an apocalyptic number.

20216031 is a deficient number, since it is larger than the sum of its proper divisors (9391137).

20216031 is a wasteful number, since it uses less digits than its factorization.

20216031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20216031 is about 4496.2240824941. The cubic root of 20216031 is about 272.4155943168.

Adding to 20216031 its reverse (13061202), we get a palindrome (33277233).

The spelling of 20216031 in words is "twenty million, two hundred sixteen thousand, thirty-one".