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20102312 = 232512789
BaseRepresentation
bin100110010101…
…1110010101000
31101211022012002
41030223302220
520121233222
61554510132
7332603216
oct114536250
941738162
1020102312
111039018a
126895348
13421ab79
142953cb6
151b71392
hex132bca8

20102312 has 8 divisors (see below), whose sum is σ = 37691850. Its totient is φ = 10051152.

The previous prime is 20102311. The next prime is 20102321. The reversal of 20102312 is 21320102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 264196 = 4454^2 + 514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20102293 and 20102302.

It is not an unprimeable number, because it can be changed into a prime (20102311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1256387 + ... + 1256402.

Almost surely, 220102312 is an apocalyptic number.

It is an amenable number.

20102312 is a deficient number, since it is larger than the sum of its proper divisors (17589538).

20102312 is a wasteful number, since it uses less digits than its factorization.

20102312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512795 (or 2512791 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20102312 is about 4483.5601925256. The cubic root of 20102312 is about 271.9038371138.

Adding to 20102312 its reverse (21320102), we get a palindrome (41422414).

The spelling of 20102312 in words is "twenty million, one hundred two thousand, three hundred twelve".

Divisors: 1 2 4 8 2512789 5025578 10051156 20102312