21086751

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{1289}}^1$

素因数の和:1359

約数の個数: 32

約数和(自身を含む): 34675200

約数和(自身を除く): 13588449

約数列:

[1, 3, 7, 19, 21, 41, 57, 123, 133, 287, 399, 779, 861, 1289, 2337, 3867, 5453, 9023, 16359, 24491, 27069, 52849, 73473, 158547, 171437, 369943, 514311, 1004131, 1109829, 3012393, 7028917, 21086751]

約数ペア:

[(1, 21086751), (3, 7028917), (7, 3012393), (19, 1109829), (21, 1004131), (41, 514311), (57, 369943), (123, 171437), (133, 158547), (287, 73473), (399, 52849), (779, 27069), (861, 24491), (1289, 16359), (2337, 9023), (3867, 5453)]