21780291285

素因数分解:

$3^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{233}}^1\times {\mathrm{13577}}^1$

素因数の和:13844

約数の個数: 80

約数和(自身を含む): 41520329136

約数和(自身を除く): 19740037851

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 233, 255, 405, 459, 699, 765, 1165, 1377, 2097, 2295, 3495, 3961, 6291, 6885, 10485, 11883, 13577, 18873, 19805, 31455, 35649, 40731, 59415, 67885, 94365, 106947, 122193, 178245, 203655, 230809, 320841, 366579, 534735, 610965, 692427, 1099737, 1154045, 1604205, 1832895, 2077281, 3163441, 3462135, 5498685, 6231843, 9490323, 10386405, 15817205, 18695529, 28470969, 31159215, 47451615, 53778497, 85412907, 93477645, 142354845, 161335491, 256238721, 268892485, 427064535, 484006473, 806677455, 1281193605, 1452019419, 2420032365, 4356058257, 7260097095, 21780291285]

約数ペア:

[(1, 21780291285), (3, 7260097095), (5, 4356058257), (9, 2420032365), (15, 1452019419), (17, 1281193605), (27, 806677455), (45, 484006473), (51, 427064535), (81, 268892485), (85, 256238721), (135, 161335491), (153, 142354845), (233, 93477645), (255, 85412907), (405, 53778497), (459, 47451615), (699, 31159215), (765, 28470969), (1165, 18695529), (1377, 15817205), (2097, 10386405), (2295, 9490323), (3495, 6231843), (3961, 5498685), (6291, 3462135), (6885, 3163441), (10485, 2077281), (11883, 1832895), (13577, 1604205), (18873, 1154045), (19805, 1099737), (31455, 692427), (35649, 610965), (40731, 534735), (59415, 366579), (67885, 320841), (94365, 230809), (106947, 203655), (122193, 178245)]