21045915

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:141

約数の個数: 96

約数和(自身を含む): 43872192

約数和(自身を除く): 22826277

約数列:

[1, 3, 5, 9, 11, 15, 17, 33, 41, 45, 51, 55, 61, 85, 99, 123, 153, 165, 183, 187, 205, 255, 305, 369, 451, 495, 549, 561, 615, 671, 697, 765, 915, 935, 1037, 1353, 1683, 1845, 2013, 2091, 2255, 2501, 2745, 2805, 3111, 3355, 3485, 4059, 5185, 6039, 6273, 6765, 7503, 7667, 8415, 9333, 10065, 10455, 11407, 12505, 15555, 20295, 22509, 23001, 27511, 30195, 31365, 34221, 37515, 38335, 42517, 46665, 57035, 69003, 82533, 102663, 112545, 115005, 127551, 137555, 171105, 212585, 247599, 345015, 382653, 412665, 467687, 513315, 637755, 1237995, 1403061, 1913265, 2338435, 4209183, 7015305, 21045915]

約数ペア:

[(1, 21045915), (3, 7015305), (5, 4209183), (9, 2338435), (11, 1913265), (15, 1403061), (17, 1237995), (33, 637755), (41, 513315), (45, 467687), (51, 412665), (55, 382653), (61, 345015), (85, 247599), (99, 212585), (123, 171105), (153, 137555), (165, 127551), (183, 115005), (187, 112545), (205, 102663), (255, 82533), (305, 69003), (369, 57035), (451, 46665), (495, 42517), (549, 38335), (561, 37515), (615, 34221), (671, 31365), (697, 30195), (765, 27511), (915, 23001), (935, 22509), (1037, 20295), (1353, 15555), (1683, 12505), (1845, 11407), (2013, 10455), (2091, 10065), (2255, 9333), (2501, 8415), (2745, 7667), (2805, 7503), (3111, 6765), (3355, 6273), (3485, 6039), (4059, 5185)]