20978716

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{401}}^1$

素因数の和:486

約数の個数: 48

約数和(自身を含む): 42547680

約数和(自身を除く): 21568964

約数列:

[1, 2, 4, 11, 22, 29, 41, 44, 58, 82, 116, 164, 319, 401, 451, 638, 802, 902, 1189, 1276, 1604, 1804, 2378, 4411, 4756, 8822, 11629, 13079, 16441, 17644, 23258, 26158, 32882, 46516, 52316, 65764, 127919, 180851, 255838, 361702, 476789, 511676, 723404, 953578, 1907156, 5244679, 10489358, 20978716]

約数ペア:

[(1, 20978716), (2, 10489358), (4, 5244679), (11, 1907156), (22, 953578), (29, 723404), (41, 511676), (44, 476789), (58, 361702), (82, 255838), (116, 180851), (164, 127919), (319, 65764), (401, 52316), (451, 46516), (638, 32882), (802, 26158), (902, 23258), (1189, 17644), (1276, 16441), (1604, 13079), (1804, 11629), (2378, 8822), (4411, 4756)]