19917880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1723}}^1$

素因数の和:1768

約数の個数: 48

約数和(自身を含む): 47634120

約数和(自身を除く): 27716240

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1723, 2312, 2890, 3446, 5780, 6892, 8615, 11560, 13784, 17230, 29291, 34460, 58582, 68920, 117164, 146455, 234328, 292910, 497947, 585820, 995894, 1171640, 1991788, 2489735, 3983576, 4979470, 9958940, 19917880]

約数ペア:

[(1, 19917880), (2, 9958940), (4, 4979470), (5, 3983576), (8, 2489735), (10, 1991788), (17, 1171640), (20, 995894), (34, 585820), (40, 497947), (68, 292910), (85, 234328), (136, 146455), (170, 117164), (289, 68920), (340, 58582), (578, 34460), (680, 29291), (1156, 17230), (1445, 13784), (1723, 11560), (2312, 8615), (2890, 6892), (3446, 5780)]