20010231 has 12 divisors (see below), whose sum is σ = 29067480. Its totient is φ = 13264560.

The previous prime is 20010223. The next prime is 20010239. The reversal of 20010231 is 13201002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20010223) and next prime (20010239).

It is not a de Polignac number, because 20010231 - 2³ = 20010223 is a prime.

It is a super-2 number, since 2×20010231² = 800818689346722, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4600 + ... + 7821.

It is an arithmetic number, because the mean of its divisors is an integer number (2422290).

Almost surely, 2^20010231 is an apocalyptic number.

20010231 is a deficient number, since it is larger than the sum of its proper divisors (9057249).

20010231 is a wasteful number, since it uses less digits than its factorization.

20010231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12606 (or 12603 counting only the distinct ones).

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

The square root of 20010231 is about 4473.2796693254. The cubic root of 20010231 is about 271.4880391137.

Adding to 20010231 its reverse (13201002), we get a palindrome (33211233).

The spelling of 20010231 in words is "twenty million, ten thousand, two hundred thirty-one".