21387275

素因数分解:

$5^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1$

素因数の和:133

約数の個数: 72

約数和(自身を含む): 35622720

約数和(自身を除く): 14235445

約数列:

[1, 5, 7, 13, 17, 25, 35, 49, 65, 79, 85, 91, 119, 175, 221, 245, 325, 395, 425, 455, 553, 595, 637, 833, 1027, 1105, 1225, 1343, 1547, 1975, 2275, 2765, 2975, 3185, 3871, 4165, 5135, 5525, 6715, 7189, 7735, 9401, 10829, 13825, 15925, 17459, 19355, 20825, 25675, 33575, 35945, 38675, 47005, 50323, 54145, 65807, 87295, 96775, 122213, 179725, 235025, 251615, 270725, 329035, 436475, 611065, 855491, 1258075, 1645175, 3055325, 4277455, 21387275]

約数ペア:

[(1, 21387275), (5, 4277455), (7, 3055325), (13, 1645175), (17, 1258075), (25, 855491), (35, 611065), (49, 436475), (65, 329035), (79, 270725), (85, 251615), (91, 235025), (119, 179725), (175, 122213), (221, 96775), (245, 87295), (325, 65807), (395, 54145), (425, 50323), (455, 47005), (553, 38675), (595, 35945), (637, 33575), (833, 25675), (1027, 20825), (1105, 19355), (1225, 17459), (1343, 15925), (1547, 13825), (1975, 10829), (2275, 9401), (2765, 7735), (2975, 7189), (3185, 6715), (3871, 5525), (4165, 5135)]