21390780

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{8291}}^1$

素因数の和:8346

約数の個数: 48

約数和(自身を含む): 61294464

約数和(自身を除く): 39903684

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 43, 60, 86, 129, 172, 215, 258, 430, 516, 645, 860, 1290, 2580, 8291, 16582, 24873, 33164, 41455, 49746, 82910, 99492, 124365, 165820, 248730, 356513, 497460, 713026, 1069539, 1426052, 1782565, 2139078, 3565130, 4278156, 5347695, 7130260, 10695390, 21390780]

約数ペア:

[(1, 21390780), (2, 10695390), (3, 7130260), (4, 5347695), (5, 4278156), (6, 3565130), (10, 2139078), (12, 1782565), (15, 1426052), (20, 1069539), (30, 713026), (43, 497460), (60, 356513), (86, 248730), (129, 165820), (172, 124365), (215, 99492), (258, 82910), (430, 49746), (516, 41455), (645, 33164), (860, 24873), (1290, 16582), (2580, 8291)]