21005985

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1399}}^1$

素因数の和:1438

約数の個数: 64

約数和(自身を含む): 45158400

約数和(自身を除く): 24152415

約数列:

[1, 3, 5, 7, 11, 13, 15, 21, 33, 35, 39, 55, 65, 77, 91, 105, 143, 165, 195, 231, 273, 385, 429, 455, 715, 1001, 1155, 1365, 1399, 2145, 3003, 4197, 5005, 6995, 9793, 15015, 15389, 18187, 20985, 29379, 46167, 48965, 54561, 76945, 90935, 107723, 127309, 146895, 200057, 230835, 272805, 323169, 381927, 538615, 600171, 636545, 1000285, 1400399, 1615845, 1909635, 3000855, 4201197, 7001995, 21005985]

約数ペア:

[(1, 21005985), (3, 7001995), (5, 4201197), (7, 3000855), (11, 1909635), (13, 1615845), (15, 1400399), (21, 1000285), (33, 636545), (35, 600171), (39, 538615), (55, 381927), (65, 323169), (77, 272805), (91, 230835), (105, 200057), (143, 146895), (165, 127309), (195, 107723), (231, 90935), (273, 76945), (385, 54561), (429, 48965), (455, 46167), (715, 29379), (1001, 20985), (1155, 18187), (1365, 15389), (1399, 15015), (2145, 9793), (3003, 6995), (4197, 5005)]