20851155

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^2$

素因数の和:245

約数の個数: 48

約数和(自身を含む): 40289760

約数和(自身を除く): 19438605

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 109, 117, 135, 195, 327, 351, 545, 585, 981, 1417, 1635, 1755, 2943, 4251, 4905, 7085, 11881, 12753, 14715, 21255, 35643, 38259, 59405, 63765, 106929, 154453, 178215, 191295, 320787, 463359, 534645, 772265, 1390077, 1603935, 2316795, 4170231, 6950385, 20851155]

約数ペア:

[(1, 20851155), (3, 6950385), (5, 4170231), (9, 2316795), (13, 1603935), (15, 1390077), (27, 772265), (39, 534645), (45, 463359), (65, 320787), (109, 191295), (117, 178215), (135, 154453), (195, 106929), (327, 63765), (351, 59405), (545, 38259), (585, 35643), (981, 21255), (1417, 14715), (1635, 12753), (1755, 11881), (2943, 7085), (4251, 4905)]