20904975

素因数分解:

$3^2\times 5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{1021}}^1$

素因数の和:1057

約数の個数: 72

約数和(自身を含む): 46128992

約数和(自身を除く): 25224017

約数列:

[1, 3, 5, 7, 9, 13, 15, 21, 25, 35, 39, 45, 63, 65, 75, 91, 105, 117, 175, 195, 225, 273, 315, 325, 455, 525, 585, 819, 975, 1021, 1365, 1575, 2275, 2925, 3063, 4095, 5105, 6825, 7147, 9189, 13273, 15315, 20475, 21441, 25525, 35735, 39819, 45945, 64323, 66365, 76575, 92911, 107205, 119457, 178675, 199095, 229725, 278733, 321615, 331825, 464555, 536025, 597285, 836199, 995475, 1393665, 1608075, 2322775, 2986425, 4180995, 6968325, 20904975]

約数ペア:

[(1, 20904975), (3, 6968325), (5, 4180995), (7, 2986425), (9, 2322775), (13, 1608075), (15, 1393665), (21, 995475), (25, 836199), (35, 597285), (39, 536025), (45, 464555), (63, 331825), (65, 321615), (75, 278733), (91, 229725), (105, 199095), (117, 178675), (175, 119457), (195, 107205), (225, 92911), (273, 76575), (315, 66365), (325, 64323), (455, 45945), (525, 39819), (585, 35735), (819, 25525), (975, 21441), (1021, 20475), (1365, 15315), (1575, 13273), (2275, 9189), (2925, 7147), (3063, 6825), (4095, 5105)]