81621160

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{157}}^1\times {\mathrm{317}}^1$

素因数の和:526

約数の個数: 64

約数和(自身を含む): 189922320

約数和(自身を除く): 108301160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 157, 164, 205, 314, 317, 328, 410, 628, 634, 785, 820, 1256, 1268, 1570, 1585, 1640, 2536, 3140, 3170, 6280, 6340, 6437, 12680, 12874, 12997, 25748, 25994, 32185, 49769, 51496, 51988, 64370, 64985, 99538, 103976, 128740, 129970, 199076, 248845, 257480, 259940, 398152, 497690, 519880, 995380, 1990760, 2040529, 4081058, 8162116, 10202645, 16324232, 20405290, 40810580, 81621160]

約数ペア:

[(1, 81621160), (2, 40810580), (4, 20405290), (5, 16324232), (8, 10202645), (10, 8162116), (20, 4081058), (40, 2040529), (41, 1990760), (82, 995380), (157, 519880), (164, 497690), (205, 398152), (314, 259940), (317, 257480), (328, 248845), (410, 199076), (628, 129970), (634, 128740), (785, 103976), (820, 99538), (1256, 64985), (1268, 64370), (1570, 51988), (1585, 51496), (1640, 49769), (2536, 32185), (3140, 25994), (3170, 25748), (6280, 12997), (6340, 12874), (6437, 12680)]