21328684

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 41912640

約数和(自身を除く): 20583956

約数列:

[1, 2, 4, 13, 26, 52, 53, 71, 106, 109, 142, 212, 218, 284, 436, 689, 923, 1378, 1417, 1846, 2756, 2834, 3692, 3763, 5668, 5777, 7526, 7739, 11554, 15052, 15478, 23108, 30956, 48919, 75101, 97838, 100607, 150202, 195676, 201214, 300404, 402428, 410167, 820334, 1640668, 5332171, 10664342, 21328684]

約数ペア:

[(1, 21328684), (2, 10664342), (4, 5332171), (13, 1640668), (26, 820334), (52, 410167), (53, 402428), (71, 300404), (106, 201214), (109, 195676), (142, 150202), (212, 100607), (218, 97838), (284, 75101), (436, 48919), (689, 30956), (923, 23108), (1378, 15478), (1417, 15052), (1846, 11554), (2756, 7739), (2834, 7526), (3692, 5777), (3763, 5668)]