21750561

素因数分解:

$3^2\times 7^2\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:131

約数の個数: 72

約数和(自身を含む): 39646464

約数和(自身を除く): 17895903

約数列:

[1, 3, 7, 9, 21, 31, 37, 43, 49, 63, 93, 111, 129, 147, 217, 259, 279, 301, 333, 387, 441, 651, 777, 903, 1147, 1333, 1519, 1591, 1813, 1953, 2107, 2331, 2709, 3441, 3999, 4557, 4773, 5439, 6321, 8029, 9331, 10323, 11137, 11997, 13671, 14319, 16317, 18963, 24087, 27993, 33411, 49321, 56203, 65317, 72261, 77959, 83979, 100233, 147963, 168609, 195951, 233877, 345247, 443889, 505827, 587853, 701631, 1035741, 2416729, 3107223, 7250187, 21750561]

約数ペア:

[(1, 21750561), (3, 7250187), (7, 3107223), (9, 2416729), (21, 1035741), (31, 701631), (37, 587853), (43, 505827), (49, 443889), (63, 345247), (93, 233877), (111, 195951), (129, 168609), (147, 147963), (217, 100233), (259, 83979), (279, 77959), (301, 72261), (333, 65317), (387, 56203), (441, 49321), (651, 33411), (777, 27993), (903, 24087), (1147, 18963), (1333, 16317), (1519, 14319), (1591, 13671), (1813, 11997), (1953, 11137), (2107, 10323), (2331, 9331), (2709, 8029), (3441, 6321), (3999, 5439), (4557, 4773)]