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20123231 is a prime number
BaseRepresentation
bin100110011000…
…0111001011111
31101212100212212
41030300321133
520122420411
61555151035
7333021212
oct114607137
941770785
1020123231
11103a4977
1268a547b
13422754b
14295b779
151b7768b
hex1330e5f

20123231 has 2 divisors, whose sum is σ = 20123232. Its totient is φ = 20123230.

The previous prime is 20123179. The next prime is 20123237. The reversal of 20123231 is 13232102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123231 - 214 = 20106847 is a prime.

It is a super-2 number, since 2×201232312 = 809888851758722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061615 + 10061616.

It is an arithmetic number, because the mean of its divisors is an integer number (10061616).

Almost surely, 220123231 is an apocalyptic number.

20123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123231 is an equidigital number, since it uses as much as digits as its factorization.

20123231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20123231 is about 4485.8924418671. The cubic root of 20123231 is about 271.9981212024.

Adding to 20123231 its reverse (13232102), we get a palindrome (33355333).

It can be divided in two parts, 201 and 23231, that added together give a palindrome (23432).

The spelling of 20123231 in words is "twenty million, one hundred twenty-three thousand, two hundred thirty-one".