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18012720 = 2435116823
BaseRepresentation
bin100010010110…
…1101000110000
31020220010210210
41010231220300
514102401340
61442024120
7306051135
oct104555060
936803723
1018012720
11a193250
126048040
133968a1b
14256c58c
1518ac180
hex112da30

18012720 has 80 divisors (see below), whose sum is σ = 60924672. Its totient is φ = 4366080.

The previous prime is 18012719. The next prime is 18012721. The reversal of 18012720 is 2721081.

It is an interprime number because it is at equal distance from previous prime (18012719) and next prime (18012721).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (18012721) 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, 772 + ... + 6051.

Almost surely, 218012720 is an apocalyptic number.

18012720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18012720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30462336).

18012720 is an abundant number, since it is smaller than the sum of its proper divisors (42911952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18012720 is a wasteful number, since it uses less digits than its factorization.

18012720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850 (or 6844 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 18012720 is about 4244.1394887539. The cubic root of 18012720 is about 262.1358579045.

The spelling of 18012720 in words is "eighteen million, twelve thousand, seven hundred twenty".

Divisors: 1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 33 40 44 48 55 60 66 80 88 110 120 132 165 176 220 240 264 330 440 528 660 880 1320 2640 6823 13646 20469 27292 34115 40938 54584 68230 75053 81876 102345 109168 136460 150106 163752 204690 225159 272920 300212 327504 375265 409380 450318 545840 600424 750530 818760 900636 1125795 1200848 1501060 1637520 1801272 2251590 3002120 3602544 4503180 6004240 9006360 18012720