81806480

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{509}}^1$

素因数の和:577

約数の個数: 120

約数和(自身を含む): 227094840

約数和(自身を除く): 145288360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 41, 49, 56, 70, 80, 82, 98, 112, 140, 164, 196, 205, 245, 280, 287, 328, 392, 410, 490, 509, 560, 574, 656, 784, 820, 980, 1018, 1148, 1435, 1640, 1960, 2009, 2036, 2296, 2545, 2870, 3280, 3563, 3920, 4018, 4072, 4592, 5090, 5740, 7126, 8036, 8144, 10045, 10180, 11480, 14252, 16072, 17815, 20090, 20360, 20869, 22960, 24941, 28504, 32144, 35630, 40180, 40720, 41738, 49882, 57008, 71260, 80360, 83476, 99764, 104345, 124705, 142520, 146083, 160720, 166952, 199528, 208690, 249410, 285040, 292166, 333904, 399056, 417380, 498820, 584332, 730415, 834760, 997640, 1022581, 1168664, 1460830, 1669520, 1995280, 2045162, 2337328, 2921660, 4090324, 5112905, 5843320, 8180648, 10225810, 11686640, 16361296, 20451620, 40903240, 81806480]

約数ペア:

[(1, 81806480), (2, 40903240), (4, 20451620), (5, 16361296), (7, 11686640), (8, 10225810), (10, 8180648), (14, 5843320), (16, 5112905), (20, 4090324), (28, 2921660), (35, 2337328), (40, 2045162), (41, 1995280), (49, 1669520), (56, 1460830), (70, 1168664), (80, 1022581), (82, 997640), (98, 834760), (112, 730415), (140, 584332), (164, 498820), (196, 417380), (205, 399056), (245, 333904), (280, 292166), (287, 285040), (328, 249410), (392, 208690), (410, 199528), (490, 166952), (509, 160720), (560, 146083), (574, 142520), (656, 124705), (784, 104345), (820, 99764), (980, 83476), (1018, 80360), (1148, 71260), (1435, 57008), (1640, 49882), (1960, 41738), (2009, 40720), (2036, 40180), (2296, 35630), (2545, 32144), (2870, 28504), (3280, 24941), (3563, 22960), (3920, 20869), (4018, 20360), (4072, 20090), (4592, 17815), (5090, 16072), (5740, 14252), (7126, 11480), (8036, 10180), (8144, 10045)]