21208860

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{239}}^1$

素因数の和:300

約数の個数: 144

約数和(自身を含む): 70761600

約数和(自身を除く): 49552740

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 17, 18, 20, 29, 30, 34, 36, 45, 51, 58, 60, 68, 85, 87, 90, 102, 116, 145, 153, 170, 174, 180, 204, 239, 255, 261, 290, 306, 340, 348, 435, 478, 493, 510, 522, 580, 612, 717, 765, 870, 956, 986, 1020, 1044, 1195, 1305, 1434, 1479, 1530, 1740, 1972, 2151, 2390, 2465, 2610, 2868, 2958, 3060, 3585, 4063, 4302, 4437, 4780, 4930, 5220, 5916, 6931, 7170, 7395, 8126, 8604, 8874, 9860, 10755, 12189, 13862, 14340, 14790, 16252, 17748, 20315, 20793, 21510, 22185, 24378, 27724, 29580, 34655, 36567, 40630, 41586, 43020, 44370, 48756, 60945, 62379, 69310, 73134, 81260, 83172, 88740, 103965, 117827, 121890, 124758, 138620, 146268, 182835, 207930, 235654, 243780, 249516, 311895, 353481, 365670, 415860, 471308, 589135, 623790, 706962, 731340, 1060443, 1178270, 1247580, 1413924, 1767405, 2120886, 2356540, 3534810, 4241772, 5302215, 7069620, 10604430, 21208860]

約数ペア:

[(1, 21208860), (2, 10604430), (3, 7069620), (4, 5302215), (5, 4241772), (6, 3534810), (9, 2356540), (10, 2120886), (12, 1767405), (15, 1413924), (17, 1247580), (18, 1178270), (20, 1060443), (29, 731340), (30, 706962), (34, 623790), (36, 589135), (45, 471308), (51, 415860), (58, 365670), (60, 353481), (68, 311895), (85, 249516), (87, 243780), (90, 235654), (102, 207930), (116, 182835), (145, 146268), (153, 138620), (170, 124758), (174, 121890), (180, 117827), (204, 103965), (239, 88740), (255, 83172), (261, 81260), (290, 73134), (306, 69310), (340, 62379), (348, 60945), (435, 48756), (478, 44370), (493, 43020), (510, 41586), (522, 40630), (580, 36567), (612, 34655), (717, 29580), (765, 27724), (870, 24378), (956, 22185), (986, 21510), (1020, 20793), (1044, 20315), (1195, 17748), (1305, 16252), (1434, 14790), (1479, 14340), (1530, 13862), (1740, 12189), (1972, 10755), (2151, 9860), (2390, 8874), (2465, 8604), (2610, 8126), (2868, 7395), (2958, 7170), (3060, 6931), (3585, 5916), (4063, 5220), (4302, 4930), (4437, 4780)]