1991990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{199}}^1$

素因数の和:237

約数の個数: 64

約数和(自身を含む): 4838400

約数和(自身を除く): 2846410

約数列:

[1, 2, 5, 7, 10, 11, 13, 14, 22, 26, 35, 55, 65, 70, 77, 91, 110, 130, 143, 154, 182, 199, 286, 385, 398, 455, 715, 770, 910, 995, 1001, 1393, 1430, 1990, 2002, 2189, 2587, 2786, 4378, 5005, 5174, 6965, 10010, 10945, 12935, 13930, 15323, 18109, 21890, 25870, 28457, 30646, 36218, 56914, 76615, 90545, 142285, 153230, 181090, 199199, 284570, 398398, 995995, 1991990]

約数ペア:

[(1, 1991990), (2, 995995), (5, 398398), (7, 284570), (10, 199199), (11, 181090), (13, 153230), (14, 142285), (22, 90545), (26, 76615), (35, 56914), (55, 36218), (65, 30646), (70, 28457), (77, 25870), (91, 21890), (110, 18109), (130, 15323), (143, 13930), (154, 12935), (182, 10945), (199, 10010), (286, 6965), (385, 5174), (398, 5005), (455, 4378), (715, 2786), (770, 2587), (910, 2189), (995, 2002), (1001, 1990), (1393, 1430)]