21918519

素因数分解:

$3^4\times 7^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1$

素因数の和:122

約数の個数: 80

約数和(自身を含む): 40888320

約数和(自身を除く): 18969801

約数列:

[1, 3, 7, 9, 21, 27, 29, 31, 43, 63, 81, 87, 93, 129, 189, 203, 217, 261, 279, 301, 387, 567, 609, 651, 783, 837, 899, 903, 1161, 1247, 1333, 1827, 1953, 2349, 2511, 2697, 2709, 3483, 3741, 3999, 5481, 5859, 6293, 8091, 8127, 8729, 9331, 11223, 11997, 16443, 17577, 18879, 24273, 24381, 26187, 27993, 33669, 35991, 38657, 56637, 72819, 78561, 83979, 101007, 107973, 115971, 169911, 235683, 251937, 270599, 347913, 509733, 707049, 755811, 811797, 1043739, 2435391, 3131217, 7306173, 21918519]

約数ペア:

[(1, 21918519), (3, 7306173), (7, 3131217), (9, 2435391), (21, 1043739), (27, 811797), (29, 755811), (31, 707049), (43, 509733), (63, 347913), (81, 270599), (87, 251937), (93, 235683), (129, 169911), (189, 115971), (203, 107973), (217, 101007), (261, 83979), (279, 78561), (301, 72819), (387, 56637), (567, 38657), (609, 35991), (651, 33669), (783, 27993), (837, 26187), (899, 24381), (903, 24273), (1161, 18879), (1247, 17577), (1333, 16443), (1827, 11997), (1953, 11223), (2349, 9331), (2511, 8729), (2697, 8127), (2709, 8091), (3483, 6293), (3741, 5859), (3999, 5481)]