20990385

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{677}}^1$

素因数の和:754

約数の個数: 48

約数和(自身を含む): 39980304

約数和(自身を除く): 18989919

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 53, 65, 117, 159, 195, 265, 477, 585, 677, 689, 795, 2031, 2067, 2385, 3385, 3445, 6093, 6201, 8801, 10155, 10335, 26403, 30465, 31005, 35881, 44005, 79209, 107643, 132015, 179405, 322929, 396045, 466453, 538215, 1399359, 1614645, 2332265, 4198077, 6996795, 20990385]

約数ペア:

[(1, 20990385), (3, 6996795), (5, 4198077), (9, 2332265), (13, 1614645), (15, 1399359), (39, 538215), (45, 466453), (53, 396045), (65, 322929), (117, 179405), (159, 132015), (195, 107643), (265, 79209), (477, 44005), (585, 35881), (677, 31005), (689, 30465), (795, 26403), (2031, 10335), (2067, 10155), (2385, 8801), (3385, 6201), (3445, 6093)]