21000015

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{283}}^1$

素因数の和:408

約数の個数: 48

約数和(自身を含む): 39076128

約数和(自身を除く): 18076113

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 97, 153, 255, 283, 291, 485, 765, 849, 873, 1415, 1455, 1649, 2547, 4245, 4365, 4811, 4947, 8245, 12735, 14433, 14841, 24055, 24735, 27451, 43299, 72165, 74205, 82353, 137255, 216495, 247059, 411765, 466667, 1235295, 1400001, 2333335, 4200003, 7000005, 21000015]

約数ペア:

[(1, 21000015), (3, 7000005), (5, 4200003), (9, 2333335), (15, 1400001), (17, 1235295), (45, 466667), (51, 411765), (85, 247059), (97, 216495), (153, 137255), (255, 82353), (283, 74205), (291, 72165), (485, 43299), (765, 27451), (849, 24735), (873, 24055), (1415, 14841), (1455, 14433), (1649, 12735), (2547, 8245), (4245, 4947), (4365, 4811)]