12891220

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 28224000

約数和(自身を除く): 15332780

約数列:

[1, 2, 4, 5, 10, 20, 41, 79, 82, 158, 164, 199, 205, 316, 395, 398, 410, 790, 796, 820, 995, 1580, 1990, 3239, 3980, 6478, 8159, 12956, 15721, 16195, 16318, 31442, 32390, 32636, 40795, 62884, 64780, 78605, 81590, 157210, 163180, 314420, 644561, 1289122, 2578244, 3222805, 6445610, 12891220]

約数ペア:

[(1, 12891220), (2, 6445610), (4, 3222805), (5, 2578244), (10, 1289122), (20, 644561), (41, 314420), (79, 163180), (82, 157210), (158, 81590), (164, 78605), (199, 64780), (205, 62884), (316, 40795), (395, 32636), (398, 32390), (410, 31442), (790, 16318), (796, 16195), (820, 15721), (995, 12956), (1580, 8159), (1990, 6478), (3239, 3980)]