20688040

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{113}}^1\times {\mathrm{199}}^1$

素因数の和:346

約数の個数: 64

約数和(自身を含む): 49248000

約数和(自身を除く): 28559960

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 113, 115, 184, 199, 226, 230, 398, 452, 460, 565, 796, 904, 920, 995, 1130, 1592, 1990, 2260, 2599, 3980, 4520, 4577, 5198, 7960, 9154, 10396, 12995, 18308, 20792, 22487, 22885, 25990, 36616, 44974, 45770, 51980, 89948, 91540, 103960, 112435, 179896, 183080, 224870, 449740, 517201, 899480, 1034402, 2068804, 2586005, 4137608, 5172010, 10344020, 20688040]

約数ペア:

[(1, 20688040), (2, 10344020), (4, 5172010), (5, 4137608), (8, 2586005), (10, 2068804), (20, 1034402), (23, 899480), (40, 517201), (46, 449740), (92, 224870), (113, 183080), (115, 179896), (184, 112435), (199, 103960), (226, 91540), (230, 89948), (398, 51980), (452, 45770), (460, 44974), (565, 36616), (796, 25990), (904, 22885), (920, 22487), (995, 20792), (1130, 18308), (1592, 12995), (1990, 10396), (2260, 9154), (2599, 7960), (3980, 5198), (4520, 4577)]