81306880

素因数分解:

$2^8\times 5^1\times {\mathrm{63521}}^1$

素因数の和:63542

約数の個数: 36

約数和(自身を含む): 194758452

約数和(自身を除く): 113451572

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 63521, 127042, 254084, 317605, 508168, 635210, 1016336, 1270420, 2032672, 2540840, 4065344, 5081680, 8130688, 10163360, 16261376, 20326720, 40653440, 81306880]

約数ペア:

[(1, 81306880), (2, 40653440), (4, 20326720), (5, 16261376), (8, 10163360), (10, 8130688), (16, 5081680), (20, 4065344), (32, 2540840), (40, 2032672), (64, 1270420), (80, 1016336), (128, 635210), (160, 508168), (256, 317605), (320, 254084), (640, 127042), (1280, 63521)]