21028371

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{197}}^1$

素因数の和:260

約数の個数: 64

約数和(自身を含む): 38320128

約数和(自身を除く): 17291757

約数列:

[1, 3, 7, 13, 17, 21, 23, 39, 51, 69, 91, 119, 161, 197, 221, 273, 299, 357, 391, 483, 591, 663, 897, 1173, 1379, 1547, 2093, 2561, 2737, 3349, 4137, 4531, 4641, 5083, 6279, 7683, 8211, 10047, 13593, 15249, 17927, 23443, 31717, 35581, 43537, 53781, 58903, 70329, 77027, 95151, 106743, 130611, 176709, 231081, 304759, 412321, 539189, 914277, 1001351, 1236963, 1617567, 3004053, 7009457, 21028371]

約数ペア:

[(1, 21028371), (3, 7009457), (7, 3004053), (13, 1617567), (17, 1236963), (21, 1001351), (23, 914277), (39, 539189), (51, 412321), (69, 304759), (91, 231081), (119, 176709), (161, 130611), (197, 106743), (221, 95151), (273, 77027), (299, 70329), (357, 58903), (391, 53781), (483, 43537), (591, 35581), (663, 31717), (897, 23443), (1173, 17927), (1379, 15249), (1547, 13593), (2093, 10047), (2561, 8211), (2737, 7683), (3349, 6279), (4137, 5083), (4531, 4641)]