21919120

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{227}}^1$

素因数の和:328

約数の個数: 80

約数和(自身を含む): 54960768

約数和(自身を除く): 33041648

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 71, 80, 85, 136, 142, 170, 227, 272, 284, 340, 355, 454, 568, 680, 710, 908, 1135, 1136, 1207, 1360, 1420, 1816, 2270, 2414, 2840, 3632, 3859, 4540, 4828, 5680, 6035, 7718, 9080, 9656, 12070, 15436, 16117, 18160, 19295, 19312, 24140, 30872, 32234, 38590, 48280, 61744, 64468, 77180, 80585, 96560, 128936, 154360, 161170, 257872, 273989, 308720, 322340, 547978, 644680, 1095956, 1289360, 1369945, 2191912, 2739890, 4383824, 5479780, 10959560, 21919120]

約数ペア:

[(1, 21919120), (2, 10959560), (4, 5479780), (5, 4383824), (8, 2739890), (10, 2191912), (16, 1369945), (17, 1289360), (20, 1095956), (34, 644680), (40, 547978), (68, 322340), (71, 308720), (80, 273989), (85, 257872), (136, 161170), (142, 154360), (170, 128936), (227, 96560), (272, 80585), (284, 77180), (340, 64468), (355, 61744), (454, 48280), (568, 38590), (680, 32234), (710, 30872), (908, 24140), (1135, 19312), (1136, 19295), (1207, 18160), (1360, 16117), (1420, 15436), (1816, 12070), (2270, 9656), (2414, 9080), (2840, 7718), (3632, 6035), (3859, 5680), (4540, 4828)]