21135645

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{139}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 38438400

約数和(自身を除く): 17302755

約数列:

[1, 3, 5, 9, 15, 31, 45, 93, 109, 139, 155, 279, 327, 417, 465, 545, 695, 981, 1251, 1395, 1635, 2085, 3379, 4309, 4905, 6255, 10137, 12927, 15151, 16895, 21545, 30411, 38781, 45453, 50685, 64635, 75755, 136359, 152055, 193905, 227265, 469681, 681795, 1409043, 2348405, 4227129, 7045215, 21135645]

約数ペア:

[(1, 21135645), (3, 7045215), (5, 4227129), (9, 2348405), (15, 1409043), (31, 681795), (45, 469681), (93, 227265), (109, 193905), (139, 152055), (155, 136359), (279, 75755), (327, 64635), (417, 50685), (465, 45453), (545, 38781), (695, 30411), (981, 21545), (1251, 16895), (1395, 15151), (1635, 12927), (2085, 10137), (3379, 6255), (4309, 4905)]