21371280

素因数分解:

$2^4\times 3^1\times 5^1\times 7^1\times {\mathrm{12721}}^1$

素因数の和:12744

約数の個数: 80

約数和(自身を含む): 75721344

約数和(自身を除く): 54350064

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 56, 60, 70, 80, 84, 105, 112, 120, 140, 168, 210, 240, 280, 336, 420, 560, 840, 1680, 12721, 25442, 38163, 50884, 63605, 76326, 89047, 101768, 127210, 152652, 178094, 190815, 203536, 254420, 267141, 305304, 356188, 381630, 445235, 508840, 534282, 610608, 712376, 763260, 890470, 1017680, 1068564, 1335705, 1424752, 1526520, 1780940, 2137128, 2671410, 3053040, 3561880, 4274256, 5342820, 7123760, 10685640, 21371280]

約数ペア:

[(1, 21371280), (2, 10685640), (3, 7123760), (4, 5342820), (5, 4274256), (6, 3561880), (7, 3053040), (8, 2671410), (10, 2137128), (12, 1780940), (14, 1526520), (15, 1424752), (16, 1335705), (20, 1068564), (21, 1017680), (24, 890470), (28, 763260), (30, 712376), (35, 610608), (40, 534282), (42, 508840), (48, 445235), (56, 381630), (60, 356188), (70, 305304), (80, 267141), (84, 254420), (105, 203536), (112, 190815), (120, 178094), (140, 152652), (168, 127210), (210, 101768), (240, 89047), (280, 76326), (336, 63605), (420, 50884), (560, 38163), (840, 25442), (1680, 12721)]