21620560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20789}}^1$

素因数の和:20815

約数の個数: 40

約数和(自身を含む): 54137160

約数和(自身を除く): 32516600

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20789, 41578, 83156, 103945, 166312, 207890, 270257, 332624, 415780, 540514, 831560, 1081028, 1351285, 1663120, 2162056, 2702570, 4324112, 5405140, 10810280, 21620560]

約数ペア:

[(1, 21620560), (2, 10810280), (4, 5405140), (5, 4324112), (8, 2702570), (10, 2162056), (13, 1663120), (16, 1351285), (20, 1081028), (26, 831560), (40, 540514), (52, 415780), (65, 332624), (80, 270257), (104, 207890), (130, 166312), (208, 103945), (260, 83156), (520, 41578), (1040, 20789)]