21989120

素因数分解:

$2^8\times 5^1\times {\mathrm{41}}^1\times {\mathrm{419}}^1$

素因数の和:481

約数の個数: 72

約数和(自身を含む): 54084240

約数和(自身を除く): 32095120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 256, 320, 328, 410, 419, 640, 656, 820, 838, 1280, 1312, 1640, 1676, 2095, 2624, 3280, 3352, 4190, 5248, 6560, 6704, 8380, 10496, 13120, 13408, 16760, 17179, 26240, 26816, 33520, 34358, 52480, 53632, 67040, 68716, 85895, 107264, 134080, 137432, 171790, 268160, 274864, 343580, 536320, 549728, 687160, 1099456, 1374320, 2198912, 2748640, 4397824, 5497280, 10994560, 21989120]

約数ペア:

[(1, 21989120), (2, 10994560), (4, 5497280), (5, 4397824), (8, 2748640), (10, 2198912), (16, 1374320), (20, 1099456), (32, 687160), (40, 549728), (41, 536320), (64, 343580), (80, 274864), (82, 268160), (128, 171790), (160, 137432), (164, 134080), (205, 107264), (256, 85895), (320, 68716), (328, 67040), (410, 53632), (419, 52480), (640, 34358), (656, 33520), (820, 26816), (838, 26240), (1280, 17179), (1312, 16760), (1640, 13408), (1676, 13120), (2095, 10496), (2624, 8380), (3280, 6704), (3352, 6560), (4190, 5248)]