19881309

素因数分解:

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

素因数の和:302

約数の個数: 24

約数和(自身を含む): 31137600

約数和(自身を除く): 11256291

約数列:

[1, 3, 7, 21, 49, 139, 147, 343, 417, 973, 1029, 2919, 6811, 19321, 20433, 47677, 57963, 135247, 143031, 405741, 946729, 2840187, 6627103, 19881309]

約数ペア:

[(1, 19881309), (3, 6627103), (7, 2840187), (21, 946729), (49, 405741), (139, 143031), (147, 135247), (343, 57963), (417, 47677), (973, 20433), (1029, 19321), (2919, 6811)]