21720660

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{27847}}^1$

素因数の和:27872

約数の個数: 48

約数和(自身を含む): 65498496

約数和(自身を除く): 43777836

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 27847, 55694, 83541, 111388, 139235, 167082, 278470, 334164, 362011, 417705, 556940, 724022, 835410, 1086033, 1448044, 1670820, 1810055, 2172066, 3620110, 4344132, 5430165, 7240220, 10860330, 21720660]

約数ペア:

[(1, 21720660), (2, 10860330), (3, 7240220), (4, 5430165), (5, 4344132), (6, 3620110), (10, 2172066), (12, 1810055), (13, 1670820), (15, 1448044), (20, 1086033), (26, 835410), (30, 724022), (39, 556940), (52, 417705), (60, 362011), (65, 334164), (78, 278470), (130, 167082), (156, 139235), (195, 111388), (260, 83541), (390, 55694), (780, 27847)]