21454420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1$

素因数の和:185

約数の個数: 96

約数和(自身を含む): 52778880

約数和(自身を除く): 31324460

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 43, 52, 65, 76, 86, 95, 101, 130, 172, 190, 202, 215, 247, 260, 380, 404, 430, 494, 505, 559, 817, 860, 988, 1010, 1118, 1235, 1313, 1634, 1919, 2020, 2236, 2470, 2626, 2795, 3268, 3838, 4085, 4343, 4940, 5252, 5590, 6565, 7676, 8170, 8686, 9595, 10621, 11180, 13130, 16340, 17372, 19190, 21242, 21715, 24947, 26260, 38380, 42484, 43430, 49894, 53105, 56459, 82517, 86860, 99788, 106210, 112918, 124735, 165034, 212420, 225836, 249470, 282295, 330068, 412585, 498940, 564590, 825170, 1072721, 1129180, 1650340, 2145442, 4290884, 5363605, 10727210, 21454420]

約数ペア:

[(1, 21454420), (2, 10727210), (4, 5363605), (5, 4290884), (10, 2145442), (13, 1650340), (19, 1129180), (20, 1072721), (26, 825170), (38, 564590), (43, 498940), (52, 412585), (65, 330068), (76, 282295), (86, 249470), (95, 225836), (101, 212420), (130, 165034), (172, 124735), (190, 112918), (202, 106210), (215, 99788), (247, 86860), (260, 82517), (380, 56459), (404, 53105), (430, 49894), (494, 43430), (505, 42484), (559, 38380), (817, 26260), (860, 24947), (988, 21715), (1010, 21242), (1118, 19190), (1235, 17372), (1313, 16340), (1634, 13130), (1919, 11180), (2020, 10621), (2236, 9595), (2470, 8686), (2626, 8170), (2795, 7676), (3268, 6565), (3838, 5590), (4085, 5252), (4343, 4940)]