21315777

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{1303}}^1$

素因数の和:1373

約数の個数: 32

約数和(自身を含む): 35051520

約数和(自身を除く): 13735743

約数列:

[1, 3, 7, 19, 21, 41, 57, 123, 133, 287, 399, 779, 861, 1303, 2337, 3909, 5453, 9121, 16359, 24757, 27363, 53423, 74271, 160269, 173299, 373961, 519897, 1015037, 1121883, 3045111, 7105259, 21315777]

約数ペア:

[(1, 21315777), (3, 7105259), (7, 3045111), (19, 1121883), (21, 1015037), (41, 519897), (57, 373961), (123, 173299), (133, 160269), (287, 74271), (399, 53423), (779, 27363), (861, 24757), (1303, 16359), (2337, 9121), (3909, 5453)]