639730220

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{281}}^1\times {\mathrm{1279}}^1$

素因数の和:1658

約数の個数: 48

約数和(自身を含む): 1364428800

約数和(自身を除く): 724698580

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 281, 356, 445, 562, 890, 1124, 1279, 1405, 1780, 2558, 2810, 5116, 5620, 6395, 12790, 25009, 25580, 50018, 100036, 113831, 125045, 227662, 250090, 359399, 455324, 500180, 569155, 718798, 1138310, 1437596, 1796995, 2276620, 3593990, 7187980, 31986511, 63973022, 127946044, 159932555, 319865110, 639730220]

約数ペア:

[(1, 639730220), (2, 319865110), (4, 159932555), (5, 127946044), (10, 63973022), (20, 31986511), (89, 7187980), (178, 3593990), (281, 2276620), (356, 1796995), (445, 1437596), (562, 1138310), (890, 718798), (1124, 569155), (1279, 500180), (1405, 455324), (1780, 359399), (2558, 250090), (2810, 227662), (5116, 125045), (5620, 113831), (6395, 100036), (12790, 50018), (25009, 25580)]