21787965

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1499}}^1$

素因数の和:1546

約数の個数: 48

約数和(自身を含む): 42120000

約数和(自身を除く): 20332035

約数列:

[1, 3, 5, 9, 15, 17, 19, 45, 51, 57, 85, 95, 153, 171, 255, 285, 323, 765, 855, 969, 1499, 1615, 2907, 4497, 4845, 7495, 13491, 14535, 22485, 25483, 28481, 67455, 76449, 85443, 127415, 142405, 229347, 256329, 382245, 427215, 484177, 1146735, 1281645, 1452531, 2420885, 4357593, 7262655, 21787965]

約数ペア:

[(1, 21787965), (3, 7262655), (5, 4357593), (9, 2420885), (15, 1452531), (17, 1281645), (19, 1146735), (45, 484177), (51, 427215), (57, 382245), (85, 256329), (95, 229347), (153, 142405), (171, 127415), (255, 85443), (285, 76449), (323, 67455), (765, 28481), (855, 25483), (969, 22485), (1499, 14535), (1615, 13491), (2907, 7495), (4497, 4845)]