19798900

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{439}}^1$

素因数の和:505

約数の個数: 72

約数和(自身を含む): 48121920

約数和(自身を除く): 28323020

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 41, 44, 50, 55, 82, 100, 110, 164, 205, 220, 275, 410, 439, 451, 550, 820, 878, 902, 1025, 1100, 1756, 1804, 2050, 2195, 2255, 4100, 4390, 4510, 4829, 8780, 9020, 9658, 10975, 11275, 17999, 19316, 21950, 22550, 24145, 35998, 43900, 45100, 48290, 71996, 89995, 96580, 120725, 179990, 197989, 241450, 359980, 395978, 449975, 482900, 791956, 899950, 989945, 1799900, 1979890, 3959780, 4949725, 9899450, 19798900]

約数ペア:

[(1, 19798900), (2, 9899450), (4, 4949725), (5, 3959780), (10, 1979890), (11, 1799900), (20, 989945), (22, 899950), (25, 791956), (41, 482900), (44, 449975), (50, 395978), (55, 359980), (82, 241450), (100, 197989), (110, 179990), (164, 120725), (205, 96580), (220, 89995), (275, 71996), (410, 48290), (439, 45100), (451, 43900), (550, 35998), (820, 24145), (878, 22550), (902, 21950), (1025, 19316), (1100, 17999), (1756, 11275), (1804, 10975), (2050, 9658), (2195, 9020), (2255, 8780), (4100, 4829), (4390, 4510)]