20160231 has 16 divisors (see below), whose sum is σ = 33083904. Its totient is φ = 10633824.

The previous prime is 20160187. The next prime is 20160251. The reversal of 20160231 is 13206102.

It is not a de Polignac number, because 20160231 - 2⁹ = 20159719 is a prime.

It is a super-2 number, since 2×20160231² = 812869827946722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20160231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20160251) 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, 36651 + ... + 37196.

It is an arithmetic number, because the mean of its divisors is an integer number (2067744).

Almost surely, 2^20160231 is an apocalyptic number.

20160231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20160231 is a deficient number, since it is larger than the sum of its proper divisors (12923673).

20160231 is a wasteful number, since it uses less digits than its factorization.

20160231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73870.

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

The square root of 20160231 is about 4490.0145879496. The cubic root of 20160231 is about 272.1647241482.

Adding to 20160231 its reverse (13206102), we get a palindrome (33366333).

The spelling of 20160231 in words is "twenty million, one hundred sixty thousand, two hundred thirty-one".