21287060

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{457}}^1$

素因数の和:620

約数の個数: 48

約数和(自身を含む): 47782224

約数和(自身を除く): 26495164

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 137, 170, 274, 340, 457, 548, 685, 914, 1370, 1828, 2285, 2329, 2740, 4570, 4658, 7769, 9140, 9316, 11645, 15538, 23290, 31076, 38845, 46580, 62609, 77690, 125218, 155380, 250436, 313045, 626090, 1064353, 1252180, 2128706, 4257412, 5321765, 10643530, 21287060]

約数ペア:

[(1, 21287060), (2, 10643530), (4, 5321765), (5, 4257412), (10, 2128706), (17, 1252180), (20, 1064353), (34, 626090), (68, 313045), (85, 250436), (137, 155380), (170, 125218), (274, 77690), (340, 62609), (457, 46580), (548, 38845), (685, 31076), (914, 23290), (1370, 15538), (1828, 11645), (2285, 9316), (2329, 9140), (2740, 7769), (4570, 4658)]