21028728

素因数分解:

$2^3\times 3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{199}}^1$

素因数の和:269

約数の個数: 128

約数和(自身を含む): 65664000

約数和(自身を除く): 44635272

約数列:

[1, 2, 3, 4, 6, 7, 8, 12, 14, 17, 21, 24, 28, 34, 37, 42, 51, 56, 68, 74, 84, 102, 111, 119, 136, 148, 168, 199, 204, 222, 238, 259, 296, 357, 398, 408, 444, 476, 518, 597, 629, 714, 777, 796, 888, 952, 1036, 1194, 1258, 1393, 1428, 1554, 1592, 1887, 2072, 2388, 2516, 2786, 2856, 3108, 3383, 3774, 4179, 4403, 4776, 5032, 5572, 6216, 6766, 7363, 7548, 8358, 8806, 10149, 11144, 13209, 13532, 14726, 15096, 16716, 17612, 20298, 22089, 23681, 26418, 27064, 29452, 33432, 35224, 40596, 44178, 47362, 51541, 52836, 58904, 71043, 81192, 88356, 94724, 103082, 105672, 125171, 142086, 154623, 176712, 189448, 206164, 250342, 284172, 309246, 375513, 412328, 500684, 568344, 618492, 751026, 876197, 1001368, 1236984, 1502052, 1752394, 2628591, 3004104, 3504788, 5257182, 7009576, 10514364, 21028728]

約数ペア:

[(1, 21028728), (2, 10514364), (3, 7009576), (4, 5257182), (6, 3504788), (7, 3004104), (8, 2628591), (12, 1752394), (14, 1502052), (17, 1236984), (21, 1001368), (24, 876197), (28, 751026), (34, 618492), (37, 568344), (42, 500684), (51, 412328), (56, 375513), (68, 309246), (74, 284172), (84, 250342), (102, 206164), (111, 189448), (119, 176712), (136, 154623), (148, 142086), (168, 125171), (199, 105672), (204, 103082), (222, 94724), (238, 88356), (259, 81192), (296, 71043), (357, 58904), (398, 52836), (408, 51541), (444, 47362), (476, 44178), (518, 40596), (597, 35224), (629, 33432), (714, 29452), (777, 27064), (796, 26418), (888, 23681), (952, 22089), (1036, 20298), (1194, 17612), (1258, 16716), (1393, 15096), (1428, 14726), (1554, 13532), (1592, 13209), (1887, 11144), (2072, 10149), (2388, 8806), (2516, 8358), (2786, 7548), (2856, 7363), (3108, 6766), (3383, 6216), (3774, 5572), (4179, 5032), (4403, 4776)]