21508641

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{757}}^1$

素因数の和:822

約数の個数: 48

約数和(自身を含む): 39731328

約数和(自身を除く): 18222687

約数列:

[1, 3, 7, 9, 11, 21, 33, 41, 63, 77, 99, 123, 231, 287, 369, 451, 693, 757, 861, 1353, 2271, 2583, 3157, 4059, 5299, 6813, 8327, 9471, 15897, 24981, 28413, 31037, 47691, 58289, 74943, 93111, 174867, 217259, 279333, 341407, 524601, 651777, 1024221, 1955331, 2389849, 3072663, 7169547, 21508641]

約数ペア:

[(1, 21508641), (3, 7169547), (7, 3072663), (9, 2389849), (11, 1955331), (21, 1024221), (33, 651777), (41, 524601), (63, 341407), (77, 279333), (99, 217259), (123, 174867), (231, 93111), (287, 74943), (369, 58289), (451, 47691), (693, 31037), (757, 28413), (861, 24981), (1353, 15897), (2271, 9471), (2583, 8327), (3157, 6813), (4059, 5299)]