19777580

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1\times {\mathrm{271}}^1$

素因数の和:410

約数の個数: 48

約数和(自身を含む): 43182720

約数和(自身を除く): 23405140

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 89, 164, 178, 205, 271, 356, 410, 445, 542, 820, 890, 1084, 1355, 1780, 2710, 3649, 5420, 7298, 11111, 14596, 18245, 22222, 24119, 36490, 44444, 48238, 55555, 72980, 96476, 111110, 120595, 222220, 241190, 482380, 988879, 1977758, 3955516, 4944395, 9888790, 19777580]

約数ペア:

[(1, 19777580), (2, 9888790), (4, 4944395), (5, 3955516), (10, 1977758), (20, 988879), (41, 482380), (82, 241190), (89, 222220), (164, 120595), (178, 111110), (205, 96476), (271, 72980), (356, 55555), (410, 48238), (445, 44444), (542, 36490), (820, 24119), (890, 22222), (1084, 18245), (1355, 14596), (1780, 11111), (2710, 7298), (3649, 5420)]