81104720

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:324

約数の個数: 80

約数和(自身を含む): 194451840

約数和(自身を除く): 113347120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 109, 131, 142, 218, 262, 284, 355, 436, 524, 545, 568, 655, 710, 872, 1048, 1090, 1136, 1310, 1420, 1744, 2096, 2180, 2620, 2840, 4360, 5240, 5680, 7739, 8720, 9301, 10480, 14279, 15478, 18602, 28558, 30956, 37204, 38695, 46505, 57116, 61912, 71395, 74408, 77390, 93010, 114232, 123824, 142790, 148816, 154780, 186020, 228464, 285580, 309560, 372040, 571160, 619120, 744080, 1013809, 1142320, 2027618, 4055236, 5069045, 8110472, 10138090, 16220944, 20276180, 40552360, 81104720]

約数ペア:

[(1, 81104720), (2, 40552360), (4, 20276180), (5, 16220944), (8, 10138090), (10, 8110472), (16, 5069045), (20, 4055236), (40, 2027618), (71, 1142320), (80, 1013809), (109, 744080), (131, 619120), (142, 571160), (218, 372040), (262, 309560), (284, 285580), (355, 228464), (436, 186020), (524, 154780), (545, 148816), (568, 142790), (655, 123824), (710, 114232), (872, 93010), (1048, 77390), (1090, 74408), (1136, 71395), (1310, 61912), (1420, 57116), (1744, 46505), (2096, 38695), (2180, 37204), (2620, 30956), (2840, 28558), (4360, 18602), (5240, 15478), (5680, 14279), (7739, 10480), (8720, 9301)]