81251080

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{487}}^1$

素因数の和:638

約数の個数: 64

約数和(自身を含む): 189383040

約数和(自身を除く): 108131960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 97, 172, 194, 215, 344, 388, 430, 485, 487, 776, 860, 970, 974, 1720, 1940, 1948, 2435, 3880, 3896, 4171, 4870, 8342, 9740, 16684, 19480, 20855, 20941, 33368, 41710, 41882, 47239, 83420, 83764, 94478, 104705, 166840, 167528, 188956, 209410, 236195, 377912, 418820, 472390, 837640, 944780, 1889560, 2031277, 4062554, 8125108, 10156385, 16250216, 20312770, 40625540, 81251080]

約数ペア:

[(1, 81251080), (2, 40625540), (4, 20312770), (5, 16250216), (8, 10156385), (10, 8125108), (20, 4062554), (40, 2031277), (43, 1889560), (86, 944780), (97, 837640), (172, 472390), (194, 418820), (215, 377912), (344, 236195), (388, 209410), (430, 188956), (485, 167528), (487, 166840), (776, 104705), (860, 94478), (970, 83764), (974, 83420), (1720, 47239), (1940, 41882), (1948, 41710), (2435, 33368), (3880, 20941), (3896, 20855), (4171, 19480), (4870, 16684), (8342, 9740)]