21705320

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:187

約数の個数: 128

約数和(自身を含む): 61689600

約数和(自身を除く): 39984280

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 35, 40, 52, 56, 65, 67, 70, 89, 91, 104, 130, 134, 140, 178, 182, 260, 268, 280, 335, 356, 364, 445, 455, 469, 520, 536, 623, 670, 712, 728, 871, 890, 910, 938, 1157, 1246, 1340, 1742, 1780, 1820, 1876, 2314, 2345, 2492, 2680, 3115, 3484, 3560, 3640, 3752, 4355, 4628, 4690, 4984, 5785, 5963, 6097, 6230, 6968, 8099, 8710, 9256, 9380, 11570, 11926, 12194, 12460, 16198, 17420, 18760, 23140, 23852, 24388, 24920, 29815, 30485, 32396, 34840, 40495, 41741, 46280, 47704, 48776, 59630, 60970, 64792, 77519, 80990, 83482, 119260, 121940, 155038, 161980, 166964, 208705, 238520, 243880, 310076, 323960, 333928, 387595, 417410, 542633, 620152, 775190, 834820, 1085266, 1550380, 1669640, 2170532, 2713165, 3100760, 4341064, 5426330, 10852660, 21705320]

約数ペア:

[(1, 21705320), (2, 10852660), (4, 5426330), (5, 4341064), (7, 3100760), (8, 2713165), (10, 2170532), (13, 1669640), (14, 1550380), (20, 1085266), (26, 834820), (28, 775190), (35, 620152), (40, 542633), (52, 417410), (56, 387595), (65, 333928), (67, 323960), (70, 310076), (89, 243880), (91, 238520), (104, 208705), (130, 166964), (134, 161980), (140, 155038), (178, 121940), (182, 119260), (260, 83482), (268, 80990), (280, 77519), (335, 64792), (356, 60970), (364, 59630), (445, 48776), (455, 47704), (469, 46280), (520, 41741), (536, 40495), (623, 34840), (670, 32396), (712, 30485), (728, 29815), (871, 24920), (890, 24388), (910, 23852), (938, 23140), (1157, 18760), (1246, 17420), (1340, 16198), (1742, 12460), (1780, 12194), (1820, 11926), (1876, 11570), (2314, 9380), (2345, 9256), (2492, 8710), (2680, 8099), (3115, 6968), (3484, 6230), (3560, 6097), (3640, 5963), (3752, 5785), (4355, 4984), (4628, 4690)]