81123920

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^2\times {\mathrm{53}}^2$

素因数の和:157

約数の個数: 90

約数和(自身を含む): 202889358

約数和(自身を除く): 121765438

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 53, 76, 80, 95, 106, 152, 190, 212, 265, 304, 361, 380, 424, 530, 722, 760, 848, 1007, 1060, 1444, 1520, 1805, 2014, 2120, 2809, 2888, 3610, 4028, 4240, 5035, 5618, 5776, 7220, 8056, 10070, 11236, 14045, 14440, 16112, 19133, 20140, 22472, 28090, 28880, 38266, 40280, 44944, 53371, 56180, 76532, 80560, 95665, 106742, 112360, 153064, 191330, 213484, 224720, 266855, 306128, 382660, 426968, 533710, 765320, 853936, 1014049, 1067420, 1530640, 2028098, 2134840, 4056196, 4269680, 5070245, 8112392, 10140490, 16224784, 20280980, 40561960, 81123920]

約数ペア:

[(1, 81123920), (2, 40561960), (4, 20280980), (5, 16224784), (8, 10140490), (10, 8112392), (16, 5070245), (19, 4269680), (20, 4056196), (38, 2134840), (40, 2028098), (53, 1530640), (76, 1067420), (80, 1014049), (95, 853936), (106, 765320), (152, 533710), (190, 426968), (212, 382660), (265, 306128), (304, 266855), (361, 224720), (380, 213484), (424, 191330), (530, 153064), (722, 112360), (760, 106742), (848, 95665), (1007, 80560), (1060, 76532), (1444, 56180), (1520, 53371), (1805, 44944), (2014, 40280), (2120, 38266), (2809, 28880), (2888, 28090), (3610, 22472), (4028, 20140), (4240, 19133), (5035, 16112), (5618, 14440), (5776, 14045), (7220, 11236), (8056, 10070)]