400400

素因数分解:

$2^4\times 5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1$

素因数の和:49

約数の個数: 120

約数和(自身を含む): 1291584

約数和(自身を除く): 891184

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 20, 22, 25, 26, 28, 35, 40, 44, 50, 52, 55, 56, 65, 70, 77, 80, 88, 91, 100, 104, 110, 112, 130, 140, 143, 154, 175, 176, 182, 200, 208, 220, 260, 275, 280, 286, 308, 325, 350, 364, 385, 400, 440, 455, 520, 550, 560, 572, 616, 650, 700, 715, 728, 770, 880, 910, 1001, 1040, 1100, 1144, 1232, 1300, 1400, 1430, 1456, 1540, 1820, 1925, 2002, 2200, 2275, 2288, 2600, 2800, 2860, 3080, 3575, 3640, 3850, 4004, 4400, 4550, 5005, 5200, 5720, 6160, 7150, 7280, 7700, 8008, 9100, 10010, 11440, 14300, 15400, 16016, 18200, 20020, 25025, 28600, 30800, 36400, 40040, 50050, 57200, 80080, 100100, 200200, 400400]

約数ペア:

[(1, 400400), (2, 200200), (4, 100100), (5, 80080), (7, 57200), (8, 50050), (10, 40040), (11, 36400), (13, 30800), (14, 28600), (16, 25025), (20, 20020), (22, 18200), (25, 16016), (26, 15400), (28, 14300), (35, 11440), (40, 10010), (44, 9100), (50, 8008), (52, 7700), (55, 7280), (56, 7150), (65, 6160), (70, 5720), (77, 5200), (80, 5005), (88, 4550), (91, 4400), (100, 4004), (104, 3850), (110, 3640), (112, 3575), (130, 3080), (140, 2860), (143, 2800), (154, 2600), (175, 2288), (176, 2275), (182, 2200), (200, 2002), (208, 1925), (220, 1820), (260, 1540), (275, 1456), (280, 1430), (286, 1400), (308, 1300), (325, 1232), (350, 1144), (364, 1100), (385, 1040), (400, 1001), (440, 910), (455, 880), (520, 770), (550, 728), (560, 715), (572, 700), (616, 650)]