20100231 has 24 divisors (see below), whose sum is σ = 30341584. Its totient is φ = 13296960.

The previous prime is 20100217. The next prime is 20100251. The reversal of 20100231 is 13200102.

It is a happy number.

It is not a de Polignac number, because 20100231 - 2⁶ = 20100167 is a prime.

It is a super-2 number, since 2×20100231² = 808038572506722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43755 + ... + 44211.

Almost surely, 2^20100231 is an apocalyptic number.

20100231 is a deficient number, since it is larger than the sum of its proper divisors (10241353).

20100231 is an equidigital number, since it uses as much as digits as its factorization.

20100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20100231 is about 4483.3281164778. The cubic root of 20100231 is about 271.8944542559.

Adding to 20100231 its reverse (13200102), we get a palindrome (33300333).

The spelling of 20100231 in words is "twenty million, one hundred thousand, two hundred thirty-one".