20817280

素因数分解:

$2^7\times 5^1\times {\mathrm{11}}^1\times {\mathrm{2957}}^1$

素因数の和:2987

約数の個数: 64

約数和(自身を含む): 54308880

約数和(自身を除く): 33491600

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 64, 80, 88, 110, 128, 160, 176, 220, 320, 352, 440, 640, 704, 880, 1408, 1760, 2957, 3520, 5914, 7040, 11828, 14785, 23656, 29570, 32527, 47312, 59140, 65054, 94624, 118280, 130108, 162635, 189248, 236560, 260216, 325270, 378496, 473120, 520432, 650540, 946240, 1040864, 1301080, 1892480, 2081728, 2602160, 4163456, 5204320, 10408640, 20817280]

約数ペア:

[(1, 20817280), (2, 10408640), (4, 5204320), (5, 4163456), (8, 2602160), (10, 2081728), (11, 1892480), (16, 1301080), (20, 1040864), (22, 946240), (32, 650540), (40, 520432), (44, 473120), (55, 378496), (64, 325270), (80, 260216), (88, 236560), (110, 189248), (128, 162635), (160, 130108), (176, 118280), (220, 94624), (320, 65054), (352, 59140), (440, 47312), (640, 32527), (704, 29570), (880, 23656), (1408, 14785), (1760, 11828), (2957, 7040), (3520, 5914)]