81712280

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{137}}^1$

素因数の和:229

約数の個数: 128

約数和(自身を含む): 211438080

約数和(自身を除く): 129725800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 37, 40, 52, 62, 65, 74, 104, 124, 130, 137, 148, 155, 185, 248, 260, 274, 296, 310, 370, 403, 481, 520, 548, 620, 685, 740, 806, 962, 1096, 1147, 1240, 1370, 1480, 1612, 1781, 1924, 2015, 2294, 2405, 2740, 3224, 3562, 3848, 4030, 4247, 4588, 4810, 5069, 5480, 5735, 7124, 8060, 8494, 8905, 9176, 9620, 10138, 11470, 14248, 14911, 16120, 16988, 17810, 19240, 20276, 21235, 22940, 25345, 29822, 33976, 35620, 40552, 42470, 45880, 50690, 55211, 59644, 65897, 71240, 74555, 84940, 101380, 110422, 119288, 131794, 149110, 157139, 169880, 202760, 220844, 263588, 276055, 298220, 314278, 329485, 441688, 527176, 552110, 596440, 628556, 658970, 785695, 1104220, 1257112, 1317940, 1571390, 2042807, 2208440, 2635880, 3142780, 4085614, 6285560, 8171228, 10214035, 16342456, 20428070, 40856140, 81712280]

約数ペア:

[(1, 81712280), (2, 40856140), (4, 20428070), (5, 16342456), (8, 10214035), (10, 8171228), (13, 6285560), (20, 4085614), (26, 3142780), (31, 2635880), (37, 2208440), (40, 2042807), (52, 1571390), (62, 1317940), (65, 1257112), (74, 1104220), (104, 785695), (124, 658970), (130, 628556), (137, 596440), (148, 552110), (155, 527176), (185, 441688), (248, 329485), (260, 314278), (274, 298220), (296, 276055), (310, 263588), (370, 220844), (403, 202760), (481, 169880), (520, 157139), (548, 149110), (620, 131794), (685, 119288), (740, 110422), (806, 101380), (962, 84940), (1096, 74555), (1147, 71240), (1240, 65897), (1370, 59644), (1480, 55211), (1612, 50690), (1781, 45880), (1924, 42470), (2015, 40552), (2294, 35620), (2405, 33976), (2740, 29822), (3224, 25345), (3562, 22940), (3848, 21235), (4030, 20276), (4247, 19240), (4588, 17810), (4810, 16988), (5069, 16120), (5480, 14911), (5735, 14248), (7124, 11470), (8060, 10138), (8494, 9620), (8905, 9176)]