815950840

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{389}}^1\times {\mathrm{1279}}^1$

素因数の和:1720

約数の個数: 64

約数和(自身を含む): 1886976000

約数和(自身を除く): 1071025160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 389, 410, 778, 820, 1279, 1556, 1640, 1945, 2558, 3112, 3890, 5116, 6395, 7780, 10232, 12790, 15560, 15949, 25580, 31898, 51160, 52439, 63796, 79745, 104878, 127592, 159490, 209756, 262195, 318980, 419512, 497531, 524390, 637960, 995062, 1048780, 1990124, 2097560, 2487655, 3980248, 4975310, 9950620, 19901240, 20398771, 40797542, 81595084, 101993855, 163190168, 203987710, 407975420, 815950840]

約数ペア:

[(1, 815950840), (2, 407975420), (4, 203987710), (5, 163190168), (8, 101993855), (10, 81595084), (20, 40797542), (40, 20398771), (41, 19901240), (82, 9950620), (164, 4975310), (205, 3980248), (328, 2487655), (389, 2097560), (410, 1990124), (778, 1048780), (820, 995062), (1279, 637960), (1556, 524390), (1640, 497531), (1945, 419512), (2558, 318980), (3112, 262195), (3890, 209756), (5116, 159490), (6395, 127592), (7780, 104878), (10232, 79745), (12790, 63796), (15560, 52439), (15949, 51160), (25580, 31898)]