21131680

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^2\times {\mathrm{457}}^1$

素因数の和:506

約数の個数: 72

約数和(自身を含む): 53149068

約数和(自身を除く): 32017388

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 289, 340, 457, 544, 578, 680, 914, 1156, 1360, 1445, 1828, 2285, 2312, 2720, 2890, 3656, 4570, 4624, 5780, 7312, 7769, 9140, 9248, 11560, 14624, 15538, 18280, 23120, 31076, 36560, 38845, 46240, 62152, 73120, 77690, 124304, 132073, 155380, 248608, 264146, 310760, 528292, 621520, 660365, 1056584, 1243040, 1320730, 2113168, 2641460, 4226336, 5282920, 10565840, 21131680]

約数ペア:

[(1, 21131680), (2, 10565840), (4, 5282920), (5, 4226336), (8, 2641460), (10, 2113168), (16, 1320730), (17, 1243040), (20, 1056584), (32, 660365), (34, 621520), (40, 528292), (68, 310760), (80, 264146), (85, 248608), (136, 155380), (160, 132073), (170, 124304), (272, 77690), (289, 73120), (340, 62152), (457, 46240), (544, 38845), (578, 36560), (680, 31076), (914, 23120), (1156, 18280), (1360, 15538), (1445, 14624), (1828, 11560), (2285, 9248), (2312, 9140), (2720, 7769), (2890, 7312), (3656, 5780), (4570, 4624)]