21478930

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{239}}^1$

素因数の和:319

約数の個数: 64

約数和(自身を含む): 45619200

約数和(自身を除く): 24140270

約数列:

[1, 2, 5, 10, 11, 19, 22, 38, 43, 55, 86, 95, 110, 190, 209, 215, 239, 418, 430, 473, 478, 817, 946, 1045, 1195, 1634, 2090, 2365, 2390, 2629, 4085, 4541, 4730, 5258, 8170, 8987, 9082, 10277, 13145, 17974, 20554, 22705, 26290, 44935, 45410, 49951, 51385, 89870, 99902, 102770, 113047, 195263, 226094, 249755, 390526, 499510, 565235, 976315, 1130470, 1952630, 2147893, 4295786, 10739465, 21478930]

約数ペア:

[(1, 21478930), (2, 10739465), (5, 4295786), (10, 2147893), (11, 1952630), (19, 1130470), (22, 976315), (38, 565235), (43, 499510), (55, 390526), (86, 249755), (95, 226094), (110, 195263), (190, 113047), (209, 102770), (215, 99902), (239, 89870), (418, 51385), (430, 49951), (473, 45410), (478, 44935), (817, 26290), (946, 22705), (1045, 20554), (1195, 17974), (1634, 13145), (2090, 10277), (2365, 9082), (2390, 8987), (2629, 8170), (4085, 5258), (4541, 4730)]