17781820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{809}}^1$

素因数の和:982

約数の個数: 48

約数和(自身を含む): 43001280

約数和(自身を除く): 25219460

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 809, 1099, 1570, 1618, 2198, 3140, 3236, 4045, 4396, 5495, 5663, 8090, 10990, 11326, 16180, 21980, 22652, 28315, 56630, 113260, 127013, 254026, 508052, 635065, 889091, 1270130, 1778182, 2540260, 3556364, 4445455, 8890910, 17781820]

約数ペア:

[(1, 17781820), (2, 8890910), (4, 4445455), (5, 3556364), (7, 2540260), (10, 1778182), (14, 1270130), (20, 889091), (28, 635065), (35, 508052), (70, 254026), (140, 127013), (157, 113260), (314, 56630), (628, 28315), (785, 22652), (809, 21980), (1099, 16180), (1570, 11326), (1618, 10990), (2198, 8090), (3140, 5663), (3236, 5495), (4045, 4396)]