17801780

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1\times {\mathrm{137}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 38601360

約数和(自身を除く): 20799580

約数列:

[1, 2, 4, 5, 10, 20, 73, 89, 137, 146, 178, 274, 292, 356, 365, 445, 548, 685, 730, 890, 1370, 1460, 1780, 2740, 6497, 10001, 12193, 12994, 20002, 24386, 25988, 32485, 40004, 48772, 50005, 60965, 64970, 100010, 121930, 129940, 200020, 243860, 890089, 1780178, 3560356, 4450445, 8900890, 17801780]

約数ペア:

[(1, 17801780), (2, 8900890), (4, 4450445), (5, 3560356), (10, 1780178), (20, 890089), (73, 243860), (89, 200020), (137, 129940), (146, 121930), (178, 100010), (274, 64970), (292, 60965), (356, 50005), (365, 48772), (445, 40004), (548, 32485), (685, 25988), (730, 24386), (890, 20002), (1370, 12994), (1460, 12193), (1780, 10001), (2740, 6497)]