21511900

素因数分解:

$2^2\times 5^2\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{199}}^1$

素因数の和:283

約数の個数: 72

約数和(自身を含む): 49996800

約数和(自身を除く): 28484900

約数列:

[1, 2, 4, 5, 10, 20, 23, 25, 46, 47, 50, 92, 94, 100, 115, 188, 199, 230, 235, 398, 460, 470, 575, 796, 940, 995, 1081, 1150, 1175, 1990, 2162, 2300, 2350, 3980, 4324, 4577, 4700, 4975, 5405, 9154, 9353, 9950, 10810, 18308, 18706, 19900, 21620, 22885, 27025, 37412, 45770, 46765, 54050, 91540, 93530, 108100, 114425, 187060, 215119, 228850, 233825, 430238, 457700, 467650, 860476, 935300, 1075595, 2151190, 4302380, 5377975, 10755950, 21511900]

約数ペア:

[(1, 21511900), (2, 10755950), (4, 5377975), (5, 4302380), (10, 2151190), (20, 1075595), (23, 935300), (25, 860476), (46, 467650), (47, 457700), (50, 430238), (92, 233825), (94, 228850), (100, 215119), (115, 187060), (188, 114425), (199, 108100), (230, 93530), (235, 91540), (398, 54050), (460, 46765), (470, 45770), (575, 37412), (796, 27025), (940, 22885), (995, 21620), (1081, 19900), (1150, 18706), (1175, 18308), (1990, 10810), (2162, 9950), (2300, 9353), (2350, 9154), (3980, 5405), (4324, 4975), (4577, 4700)]