21257340

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{27253}}^1$

素因数の和:27278

約数の個数: 48

約数和(自身を含む): 64101408

約数和(自身を除く): 42844068

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 27253, 54506, 81759, 109012, 136265, 163518, 272530, 327036, 354289, 408795, 545060, 708578, 817590, 1062867, 1417156, 1635180, 1771445, 2125734, 3542890, 4251468, 5314335, 7085780, 10628670, 21257340]

約数ペア:

[(1, 21257340), (2, 10628670), (3, 7085780), (4, 5314335), (5, 4251468), (6, 3542890), (10, 2125734), (12, 1771445), (13, 1635180), (15, 1417156), (20, 1062867), (26, 817590), (30, 708578), (39, 545060), (52, 408795), (60, 354289), (65, 327036), (78, 272530), (130, 163518), (156, 136265), (195, 109012), (260, 81759), (390, 54506), (780, 27253)]