21547790

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:209

約数の個数: 64

約数和(自身を含む): 44789760

約数和(自身を除く): 23241970

約数列:

[1, 2, 5, 10, 11, 22, 31, 55, 62, 71, 89, 110, 142, 155, 178, 310, 341, 355, 445, 682, 710, 781, 890, 979, 1562, 1705, 1958, 2201, 2759, 3410, 3905, 4402, 4895, 5518, 6319, 7810, 9790, 11005, 12638, 13795, 22010, 24211, 27590, 30349, 31595, 48422, 60698, 63190, 69509, 121055, 139018, 151745, 195889, 242110, 303490, 347545, 391778, 695090, 979445, 1958890, 2154779, 4309558, 10773895, 21547790]

約数ペア:

[(1, 21547790), (2, 10773895), (5, 4309558), (10, 2154779), (11, 1958890), (22, 979445), (31, 695090), (55, 391778), (62, 347545), (71, 303490), (89, 242110), (110, 195889), (142, 151745), (155, 139018), (178, 121055), (310, 69509), (341, 63190), (355, 60698), (445, 48422), (682, 31595), (710, 30349), (781, 27590), (890, 24211), (979, 22010), (1562, 13795), (1705, 12638), (1958, 11005), (2201, 9790), (2759, 7810), (3410, 6319), (3905, 5518), (4402, 4895)]