256988781

素因数分解:

$3^5\times 7^2\times {\mathrm{113}}^1\times {\mathrm{191}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 454132224

約数和(自身を除く): 197143443

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 113, 147, 189, 191, 243, 339, 441, 567, 573, 791, 1017, 1323, 1337, 1701, 1719, 2373, 3051, 3969, 4011, 5157, 5537, 7119, 9153, 9359, 11907, 12033, 15471, 16611, 21357, 21583, 27459, 28077, 36099, 46413, 49833, 64071, 64749, 84231, 108297, 149499, 151081, 192213, 194247, 252693, 324891, 448497, 453243, 582741, 758079, 1057567, 1345491, 1359729, 1748223, 2274237, 3172701, 4079187, 5244669, 9518103, 12237561, 28554309, 36712683, 85662927, 256988781]

約数ペア:

[(1, 256988781), (3, 85662927), (7, 36712683), (9, 28554309), (21, 12237561), (27, 9518103), (49, 5244669), (63, 4079187), (81, 3172701), (113, 2274237), (147, 1748223), (189, 1359729), (191, 1345491), (243, 1057567), (339, 758079), (441, 582741), (567, 453243), (573, 448497), (791, 324891), (1017, 252693), (1323, 194247), (1337, 192213), (1701, 151081), (1719, 149499), (2373, 108297), (3051, 84231), (3969, 64749), (4011, 64071), (5157, 49833), (5537, 46413), (7119, 36099), (9153, 28077), (9359, 27459), (11907, 21583), (12033, 21357), (15471, 16611)]