81445840

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{263}}^1$

素因数の和:369

約数の個数: 120

約数和(自身を含む): 223914240

約数和(自身を除く): 142468400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 79, 80, 98, 112, 140, 158, 196, 245, 263, 280, 316, 392, 395, 490, 526, 553, 560, 632, 784, 790, 980, 1052, 1106, 1264, 1315, 1580, 1841, 1960, 2104, 2212, 2630, 2765, 3160, 3682, 3871, 3920, 4208, 4424, 5260, 5530, 6320, 7364, 7742, 8848, 9205, 10520, 11060, 12887, 14728, 15484, 18410, 19355, 20777, 21040, 22120, 25774, 29456, 30968, 36820, 38710, 41554, 44240, 51548, 61936, 64435, 73640, 77420, 83108, 103096, 103885, 128870, 145439, 147280, 154840, 166216, 206192, 207770, 257740, 290878, 309680, 332432, 415540, 515480, 581756, 727195, 831080, 1018073, 1030960, 1163512, 1454390, 1662160, 2036146, 2327024, 2908780, 4072292, 5090365, 5817560, 8144584, 10180730, 11635120, 16289168, 20361460, 40722920, 81445840]

約数ペア:

[(1, 81445840), (2, 40722920), (4, 20361460), (5, 16289168), (7, 11635120), (8, 10180730), (10, 8144584), (14, 5817560), (16, 5090365), (20, 4072292), (28, 2908780), (35, 2327024), (40, 2036146), (49, 1662160), (56, 1454390), (70, 1163512), (79, 1030960), (80, 1018073), (98, 831080), (112, 727195), (140, 581756), (158, 515480), (196, 415540), (245, 332432), (263, 309680), (280, 290878), (316, 257740), (392, 207770), (395, 206192), (490, 166216), (526, 154840), (553, 147280), (560, 145439), (632, 128870), (784, 103885), (790, 103096), (980, 83108), (1052, 77420), (1106, 73640), (1264, 64435), (1315, 61936), (1580, 51548), (1841, 44240), (1960, 41554), (2104, 38710), (2212, 36820), (2630, 30968), (2765, 29456), (3160, 25774), (3682, 22120), (3871, 21040), (3920, 20777), (4208, 19355), (4424, 18410), (5260, 15484), (5530, 14728), (6320, 12887), (7364, 11060), (7742, 10520), (8848, 9205)]