81857440

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{197}}^1$

素因数の和:279

約数の個数: 144

約数和(自身を含む): 230369832

約数和(自身を除く): 148512392

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 53, 56, 70, 80, 98, 106, 112, 140, 160, 196, 197, 212, 224, 245, 265, 280, 371, 392, 394, 424, 490, 530, 560, 742, 784, 788, 848, 980, 985, 1060, 1120, 1379, 1484, 1568, 1576, 1696, 1855, 1960, 1970, 2120, 2597, 2758, 2968, 3152, 3710, 3920, 3940, 4240, 5194, 5516, 5936, 6304, 6895, 7420, 7840, 7880, 8480, 9653, 10388, 10441, 11032, 11872, 12985, 13790, 14840, 15760, 19306, 20776, 20882, 22064, 25970, 27580, 29680, 31520, 38612, 41552, 41764, 44128, 48265, 51940, 52205, 55160, 59360, 73087, 77224, 83104, 83528, 96530, 103880, 104410, 110320, 146174, 154448, 167056, 193060, 207760, 208820, 220640, 292348, 308896, 334112, 365435, 386120, 415520, 417640, 511609, 584696, 730870, 772240, 835280, 1023218, 1169392, 1461740, 1544480, 1670560, 2046436, 2338784, 2558045, 2923480, 4092872, 5116090, 5846960, 8185744, 10232180, 11693920, 16371488, 20464360, 40928720, 81857440]

約数ペア:

[(1, 81857440), (2, 40928720), (4, 20464360), (5, 16371488), (7, 11693920), (8, 10232180), (10, 8185744), (14, 5846960), (16, 5116090), (20, 4092872), (28, 2923480), (32, 2558045), (35, 2338784), (40, 2046436), (49, 1670560), (53, 1544480), (56, 1461740), (70, 1169392), (80, 1023218), (98, 835280), (106, 772240), (112, 730870), (140, 584696), (160, 511609), (196, 417640), (197, 415520), (212, 386120), (224, 365435), (245, 334112), (265, 308896), (280, 292348), (371, 220640), (392, 208820), (394, 207760), (424, 193060), (490, 167056), (530, 154448), (560, 146174), (742, 110320), (784, 104410), (788, 103880), (848, 96530), (980, 83528), (985, 83104), (1060, 77224), (1120, 73087), (1379, 59360), (1484, 55160), (1568, 52205), (1576, 51940), (1696, 48265), (1855, 44128), (1960, 41764), (1970, 41552), (2120, 38612), (2597, 31520), (2758, 29680), (2968, 27580), (3152, 25970), (3710, 22064), (3920, 20882), (3940, 20776), (4240, 19306), (5194, 15760), (5516, 14840), (5936, 13790), (6304, 12985), (6895, 11872), (7420, 11032), (7840, 10441), (7880, 10388), (8480, 9653)]