19983740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{349}}^1\times {\mathrm{409}}^1$

素因数の和:774

約数の個数: 48

約数和(自身を含む): 48216000

約数和(自身を除く): 28232260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 349, 409, 698, 818, 1396, 1636, 1745, 2045, 2443, 2863, 3490, 4090, 4886, 5726, 6980, 8180, 9772, 11452, 12215, 14315, 24430, 28630, 48860, 57260, 142741, 285482, 570964, 713705, 999187, 1427410, 1998374, 2854820, 3996748, 4995935, 9991870, 19983740]

約数ペア:

[(1, 19983740), (2, 9991870), (4, 4995935), (5, 3996748), (7, 2854820), (10, 1998374), (14, 1427410), (20, 999187), (28, 713705), (35, 570964), (70, 285482), (140, 142741), (349, 57260), (409, 48860), (698, 28630), (818, 24430), (1396, 14315), (1636, 12215), (1745, 11452), (2045, 9772), (2443, 8180), (2863, 6980), (3490, 5726), (4090, 4886)]