20807605

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 32175360

約数和(自身を除く): 11367755

約数列:

[1, 5, 7, 13, 35, 47, 49, 65, 91, 139, 235, 245, 329, 455, 611, 637, 695, 973, 1645, 1807, 2303, 3055, 3185, 4277, 4865, 6533, 6811, 9035, 11515, 12649, 21385, 29939, 32665, 34055, 45731, 63245, 84929, 88543, 149695, 228655, 320117, 424645, 442715, 594503, 1600585, 2972515, 4161521, 20807605]

約数ペア:

[(1, 20807605), (5, 4161521), (7, 2972515), (13, 1600585), (35, 594503), (47, 442715), (49, 424645), (65, 320117), (91, 228655), (139, 149695), (235, 88543), (245, 84929), (329, 63245), (455, 45731), (611, 34055), (637, 32665), (695, 29939), (973, 21385), (1645, 12649), (1807, 11515), (2303, 9035), (3055, 6811), (3185, 6533), (4277, 4865)]