21140217

素因数分解:

$3^3\times 7^2\times {\mathrm{19}}^1\times {\mathrm{29}}^2$

素因数の和:100

約数の個数: 72

約数和(自身を含む): 39717600

約数和(自身を除く): 18577383

約数列:

[1, 3, 7, 9, 19, 21, 27, 29, 49, 57, 63, 87, 133, 147, 171, 189, 203, 261, 399, 441, 513, 551, 609, 783, 841, 931, 1197, 1323, 1421, 1653, 1827, 2523, 2793, 3591, 3857, 4263, 4959, 5481, 5887, 7569, 8379, 11571, 12789, 14877, 15979, 17661, 22707, 25137, 26999, 34713, 38367, 41209, 47937, 52983, 80997, 104139, 111853, 123627, 143811, 158949, 242991, 335559, 370881, 431433, 728973, 782971, 1006677, 1112643, 2348913, 3020031, 7046739, 21140217]

約数ペア:

[(1, 21140217), (3, 7046739), (7, 3020031), (9, 2348913), (19, 1112643), (21, 1006677), (27, 782971), (29, 728973), (49, 431433), (57, 370881), (63, 335559), (87, 242991), (133, 158949), (147, 143811), (171, 123627), (189, 111853), (203, 104139), (261, 80997), (399, 52983), (441, 47937), (513, 41209), (551, 38367), (609, 34713), (783, 26999), (841, 25137), (931, 22707), (1197, 17661), (1323, 15979), (1421, 14877), (1653, 12789), (1827, 11571), (2523, 8379), (2793, 7569), (3591, 5887), (3857, 5481), (4263, 4959)]