19960720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1129}}^1$

素因数の和:1172

約数の個数: 80

約数和(自身を含む): 52965360

約数和(自身を除く): 33004640

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 26, 34, 40, 52, 65, 68, 80, 85, 104, 130, 136, 170, 208, 221, 260, 272, 340, 442, 520, 680, 884, 1040, 1105, 1129, 1360, 1768, 2210, 2258, 3536, 4420, 4516, 5645, 8840, 9032, 11290, 14677, 17680, 18064, 19193, 22580, 29354, 38386, 45160, 58708, 73385, 76772, 90320, 95965, 117416, 146770, 153544, 191930, 234832, 249509, 293540, 307088, 383860, 499018, 587080, 767720, 998036, 1174160, 1247545, 1535440, 1996072, 2495090, 3992144, 4990180, 9980360, 19960720]

約数ペア:

[(1, 19960720), (2, 9980360), (4, 4990180), (5, 3992144), (8, 2495090), (10, 1996072), (13, 1535440), (16, 1247545), (17, 1174160), (20, 998036), (26, 767720), (34, 587080), (40, 499018), (52, 383860), (65, 307088), (68, 293540), (80, 249509), (85, 234832), (104, 191930), (130, 153544), (136, 146770), (170, 117416), (208, 95965), (221, 90320), (260, 76772), (272, 73385), (340, 58708), (442, 45160), (520, 38386), (680, 29354), (884, 22580), (1040, 19193), (1105, 18064), (1129, 17680), (1360, 14677), (1768, 11290), (2210, 9032), (2258, 8840), (3536, 5645), (4420, 4516)]