20005120

素因数分解:

$2^8\times 5^1\times {\mathrm{15629}}^1$

素因数の和:15650

約数の個数: 36

約数和(自身を含む): 47921580

約数和(自身を除く): 27916460

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 15629, 31258, 62516, 78145, 125032, 156290, 250064, 312580, 500128, 625160, 1000256, 1250320, 2000512, 2500640, 4001024, 5001280, 10002560, 20005120]

約数ペア:

[(1, 20005120), (2, 10002560), (4, 5001280), (5, 4001024), (8, 2500640), (10, 2000512), (16, 1250320), (20, 1000256), (32, 625160), (40, 500128), (64, 312580), (80, 250064), (128, 156290), (160, 125032), (256, 78145), (320, 62516), (640, 31258), (1280, 15629)]