21404655

素因数分解:

$3^5\times 5^1\times {\mathrm{79}}^1\times {\mathrm{223}}^1$

素因数の和:322

約数の個数: 48

約数和(自身を含む): 39137280

約数和(自身を除く): 17732625

約数列:

[1, 3, 5, 9, 15, 27, 45, 79, 81, 135, 223, 237, 243, 395, 405, 669, 711, 1115, 1185, 1215, 2007, 2133, 3345, 3555, 6021, 6399, 10035, 10665, 17617, 18063, 19197, 30105, 31995, 52851, 54189, 88085, 90315, 95985, 158553, 264255, 270945, 475659, 792765, 1426977, 2378295, 4280931, 7134885, 21404655]

約数ペア:

[(1, 21404655), (3, 7134885), (5, 4280931), (9, 2378295), (15, 1426977), (27, 792765), (45, 475659), (79, 270945), (81, 264255), (135, 158553), (223, 95985), (237, 90315), (243, 88085), (395, 54189), (405, 52851), (669, 31995), (711, 30105), (1115, 19197), (1185, 18063), (1215, 17617), (2007, 10665), (2133, 10035), (3345, 6399), (3555, 6021)]