81245920

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{241}}^1$

素因数の和:313

約数の個数: 144

約数和(自身を含む): 229421808

約数和(自身を除く): 148175888

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 43, 49, 56, 70, 80, 86, 98, 112, 140, 160, 172, 196, 215, 224, 241, 245, 280, 301, 344, 392, 430, 482, 490, 560, 602, 688, 784, 860, 964, 980, 1120, 1204, 1205, 1376, 1505, 1568, 1687, 1720, 1928, 1960, 2107, 2408, 2410, 3010, 3374, 3440, 3856, 3920, 4214, 4816, 4820, 6020, 6748, 6880, 7712, 7840, 8428, 8435, 9632, 9640, 10363, 10535, 11809, 12040, 13496, 16856, 16870, 19280, 20726, 21070, 23618, 24080, 26992, 33712, 33740, 38560, 41452, 42140, 47236, 48160, 51815, 53984, 59045, 67424, 67480, 72541, 82904, 84280, 94472, 103630, 118090, 134960, 145082, 165808, 168560, 188944, 207260, 236180, 269920, 290164, 331616, 337120, 362705, 377888, 414520, 472360, 507787, 580328, 725410, 829040, 944720, 1015574, 1160656, 1450820, 1658080, 1889440, 2031148, 2321312, 2538935, 2901640, 4062296, 5077870, 5803280, 8124592, 10155740, 11606560, 16249184, 20311480, 40622960, 81245920]

約数ペア:

[(1, 81245920), (2, 40622960), (4, 20311480), (5, 16249184), (7, 11606560), (8, 10155740), (10, 8124592), (14, 5803280), (16, 5077870), (20, 4062296), (28, 2901640), (32, 2538935), (35, 2321312), (40, 2031148), (43, 1889440), (49, 1658080), (56, 1450820), (70, 1160656), (80, 1015574), (86, 944720), (98, 829040), (112, 725410), (140, 580328), (160, 507787), (172, 472360), (196, 414520), (215, 377888), (224, 362705), (241, 337120), (245, 331616), (280, 290164), (301, 269920), (344, 236180), (392, 207260), (430, 188944), (482, 168560), (490, 165808), (560, 145082), (602, 134960), (688, 118090), (784, 103630), (860, 94472), (964, 84280), (980, 82904), (1120, 72541), (1204, 67480), (1205, 67424), (1376, 59045), (1505, 53984), (1568, 51815), (1687, 48160), (1720, 47236), (1928, 42140), (1960, 41452), (2107, 38560), (2408, 33740), (2410, 33712), (3010, 26992), (3374, 24080), (3440, 23618), (3856, 21070), (3920, 20726), (4214, 19280), (4816, 16870), (4820, 16856), (6020, 13496), (6748, 12040), (6880, 11809), (7712, 10535), (7840, 10363), (8428, 9640), (8435, 9632)]