21305680

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:137

約数の個数: 120

約数和(自身を含む): 56996352

約数和(自身を除く): 35690672

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 31, 40, 44, 55, 62, 71, 80, 88, 110, 121, 124, 142, 155, 176, 220, 242, 248, 284, 310, 341, 355, 440, 484, 496, 568, 605, 620, 682, 710, 781, 880, 968, 1136, 1210, 1240, 1364, 1420, 1562, 1705, 1936, 2201, 2420, 2480, 2728, 2840, 3124, 3410, 3751, 3905, 4402, 4840, 5456, 5680, 6248, 6820, 7502, 7810, 8591, 8804, 9680, 11005, 12496, 13640, 15004, 15620, 17182, 17608, 18755, 22010, 24211, 27280, 30008, 31240, 34364, 35216, 37510, 42955, 44020, 48422, 60016, 62480, 68728, 75020, 85910, 88040, 96844, 121055, 137456, 150040, 171820, 176080, 193688, 242110, 266321, 300080, 343640, 387376, 484220, 532642, 687280, 968440, 1065284, 1331605, 1936880, 2130568, 2663210, 4261136, 5326420, 10652840, 21305680]

約数ペア:

[(1, 21305680), (2, 10652840), (4, 5326420), (5, 4261136), (8, 2663210), (10, 2130568), (11, 1936880), (16, 1331605), (20, 1065284), (22, 968440), (31, 687280), (40, 532642), (44, 484220), (55, 387376), (62, 343640), (71, 300080), (80, 266321), (88, 242110), (110, 193688), (121, 176080), (124, 171820), (142, 150040), (155, 137456), (176, 121055), (220, 96844), (242, 88040), (248, 85910), (284, 75020), (310, 68728), (341, 62480), (355, 60016), (440, 48422), (484, 44020), (496, 42955), (568, 37510), (605, 35216), (620, 34364), (682, 31240), (710, 30008), (781, 27280), (880, 24211), (968, 22010), (1136, 18755), (1210, 17608), (1240, 17182), (1364, 15620), (1420, 15004), (1562, 13640), (1705, 12496), (1936, 11005), (2201, 9680), (2420, 8804), (2480, 8591), (2728, 7810), (2840, 7502), (3124, 6820), (3410, 6248), (3751, 5680), (3905, 5456), (4402, 4840)]