21717927

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^3\times {\mathrm{37}}^1$

素因数の和:90

約数の個数: 72

約数和(自身を含む): 41223312

約数和(自身を除く): 19505385

約数列:

[1, 3, 7, 9, 11, 21, 33, 37, 49, 63, 77, 99, 111, 121, 147, 231, 259, 333, 363, 407, 441, 539, 693, 777, 847, 1089, 1221, 1331, 1617, 1813, 2331, 2541, 2849, 3663, 3993, 4477, 4851, 5439, 5929, 7623, 8547, 9317, 11979, 13431, 16317, 17787, 19943, 25641, 27951, 31339, 40293, 49247, 53361, 59829, 65219, 83853, 94017, 147741, 179487, 195657, 219373, 282051, 344729, 443223, 586971, 658119, 1034187, 1974357, 2413103, 3102561, 7239309, 21717927]

約数ペア:

[(1, 21717927), (3, 7239309), (7, 3102561), (9, 2413103), (11, 1974357), (21, 1034187), (33, 658119), (37, 586971), (49, 443223), (63, 344729), (77, 282051), (99, 219373), (111, 195657), (121, 179487), (147, 147741), (231, 94017), (259, 83853), (333, 65219), (363, 59829), (407, 53361), (441, 49247), (539, 40293), (693, 31339), (777, 27951), (847, 25641), (1089, 19943), (1221, 17787), (1331, 16317), (1617, 13431), (1813, 11979), (2331, 9317), (2541, 8547), (2849, 7623), (3663, 5929), (3993, 5439), (4477, 4851)]