20778680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1289}}^1$

素因数の和:1344

約数の個数: 64

約数和(自身を含む): 52012800

約数和(自身を除く): 31234120

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1289, 1612, 2015, 2578, 3224, 4030, 5156, 6445, 8060, 10312, 12890, 16120, 16757, 25780, 33514, 39959, 51560, 67028, 79918, 83785, 134056, 159836, 167570, 199795, 319672, 335140, 399590, 519467, 670280, 799180, 1038934, 1598360, 2077868, 2597335, 4155736, 5194670, 10389340, 20778680]

約数ペア:

[(1, 20778680), (2, 10389340), (4, 5194670), (5, 4155736), (8, 2597335), (10, 2077868), (13, 1598360), (20, 1038934), (26, 799180), (31, 670280), (40, 519467), (52, 399590), (62, 335140), (65, 319672), (104, 199795), (124, 167570), (130, 159836), (155, 134056), (248, 83785), (260, 79918), (310, 67028), (403, 51560), (520, 39959), (620, 33514), (806, 25780), (1240, 16757), (1289, 16120), (1612, 12890), (2015, 10312), (2578, 8060), (3224, 6445), (4030, 5156)]