18997825

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 29998080

約数和(自身を除く): 11000255

約数列:

[1, 5, 7, 11, 25, 35, 55, 71, 77, 139, 175, 275, 355, 385, 497, 695, 781, 973, 1529, 1775, 1925, 2485, 3475, 3905, 4865, 5467, 7645, 9869, 10703, 12425, 19525, 24325, 27335, 38225, 49345, 53515, 69083, 108559, 136675, 246725, 267575, 345415, 542795, 759913, 1727075, 2713975, 3799565, 18997825]

約数ペア:

[(1, 18997825), (5, 3799565), (7, 2713975), (11, 1727075), (25, 759913), (35, 542795), (55, 345415), (71, 267575), (77, 246725), (139, 136675), (175, 108559), (275, 69083), (355, 53515), (385, 49345), (497, 38225), (695, 27335), (781, 24325), (973, 19525), (1529, 12425), (1775, 10703), (1925, 9869), (2485, 7645), (3475, 5467), (3905, 4865)]