16991975

素因数分解:

$5^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1$

素因数の和:145

約数の個数: 72

約数和(自身を含む): 29091888

約数和(自身を除く): 12099913

約数列:

[1, 5, 7, 11, 13, 25, 35, 49, 55, 65, 77, 91, 97, 143, 175, 245, 275, 325, 385, 455, 485, 539, 637, 679, 715, 1001, 1067, 1225, 1261, 1925, 2275, 2425, 2695, 3185, 3395, 3575, 4753, 5005, 5335, 6305, 7007, 7469, 8827, 13475, 13871, 15925, 16975, 23765, 25025, 26675, 31525, 35035, 37345, 44135, 52283, 61789, 69355, 97097, 118825, 175175, 186725, 220675, 261415, 308945, 346775, 485485, 679679, 1307075, 1544725, 2427425, 3398395, 16991975]

約数ペア:

[(1, 16991975), (5, 3398395), (7, 2427425), (11, 1544725), (13, 1307075), (25, 679679), (35, 485485), (49, 346775), (55, 308945), (65, 261415), (77, 220675), (91, 186725), (97, 175175), (143, 118825), (175, 97097), (245, 69355), (275, 61789), (325, 52283), (385, 44135), (455, 37345), (485, 35035), (539, 31525), (637, 26675), (679, 25025), (715, 23765), (1001, 16975), (1067, 15925), (1225, 13871), (1261, 13475), (1925, 8827), (2275, 7469), (2425, 7007), (2695, 6305), (3185, 5335), (3395, 5005), (3575, 4753)]