20289969

素因数分解:

$3^2\times 7^2\times {\mathrm{139}}^1\times {\mathrm{331}}^1$

素因数の和:490

約数の個数: 36

約数和(自身を含む): 34441680

約数和(自身を除く): 14151711

約数列:

[1, 3, 7, 9, 21, 49, 63, 139, 147, 331, 417, 441, 973, 993, 1251, 2317, 2919, 2979, 6811, 6951, 8757, 16219, 20433, 20853, 46009, 48657, 61299, 138027, 145971, 322063, 414081, 966189, 2254441, 2898567, 6763323, 20289969]

約数ペア:

[(1, 20289969), (3, 6763323), (7, 2898567), (9, 2254441), (21, 966189), (49, 414081), (63, 322063), (139, 145971), (147, 138027), (331, 61299), (417, 48657), (441, 46009), (973, 20853), (993, 20433), (1251, 16219), (2317, 8757), (2919, 6951), (2979, 6811)]