20645120

素因数分解:

$2^8\times 5^1\times {\mathrm{127}}^2$

素因数の和:275

約数の個数: 54

約数和(自身を含む): 49843962

約数和(自身を除く): 29198842

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 127, 128, 160, 254, 256, 320, 508, 635, 640, 1016, 1270, 1280, 2032, 2540, 4064, 5080, 8128, 10160, 16129, 16256, 20320, 32258, 32512, 40640, 64516, 80645, 81280, 129032, 161290, 162560, 258064, 322580, 516128, 645160, 1032256, 1290320, 2064512, 2580640, 4129024, 5161280, 10322560, 20645120]

約数ペア:

[(1, 20645120), (2, 10322560), (4, 5161280), (5, 4129024), (8, 2580640), (10, 2064512), (16, 1290320), (20, 1032256), (32, 645160), (40, 516128), (64, 322580), (80, 258064), (127, 162560), (128, 161290), (160, 129032), (254, 81280), (256, 80645), (320, 64516), (508, 40640), (635, 32512), (640, 32258), (1016, 20320), (1270, 16256), (1280, 16129), (2032, 10160), (2540, 8128), (4064, 5080)]