21195260

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{193}}^1$

素因数の和:255

約数の個数: 72

約数和(自身を含む): 50028720

約数和(自身を除く): 28833460

約数列:

[1, 2, 4, 5, 10, 17, 19, 20, 34, 38, 68, 76, 85, 95, 170, 190, 193, 289, 323, 340, 380, 386, 578, 646, 772, 965, 1156, 1292, 1445, 1615, 1930, 2890, 3230, 3281, 3667, 3860, 5491, 5780, 6460, 6562, 7334, 10982, 13124, 14668, 16405, 18335, 21964, 27455, 32810, 36670, 54910, 55777, 62339, 65620, 73340, 109820, 111554, 124678, 223108, 249356, 278885, 311695, 557770, 623390, 1059763, 1115540, 1246780, 2119526, 4239052, 5298815, 10597630, 21195260]

約数ペア:

[(1, 21195260), (2, 10597630), (4, 5298815), (5, 4239052), (10, 2119526), (17, 1246780), (19, 1115540), (20, 1059763), (34, 623390), (38, 557770), (68, 311695), (76, 278885), (85, 249356), (95, 223108), (170, 124678), (190, 111554), (193, 109820), (289, 73340), (323, 65620), (340, 62339), (380, 55777), (386, 54910), (578, 36670), (646, 32810), (772, 27455), (965, 21964), (1156, 18335), (1292, 16405), (1445, 14668), (1615, 13124), (1930, 10982), (2890, 7334), (3230, 6562), (3281, 6460), (3667, 5780), (3860, 5491)]