20491640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{251}}^1$

素因数の和:432

約数の個数: 64

約数和(自身を含む): 50168160

約数和(自身を除く): 29676520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 157, 251, 260, 314, 502, 520, 628, 785, 1004, 1255, 1256, 1570, 2008, 2041, 2510, 3140, 3263, 4082, 5020, 6280, 6526, 8164, 10040, 10205, 13052, 16315, 16328, 20410, 26104, 32630, 39407, 40820, 65260, 78814, 81640, 130520, 157628, 197035, 315256, 394070, 512291, 788140, 1024582, 1576280, 2049164, 2561455, 4098328, 5122910, 10245820, 20491640]

約数ペア:

[(1, 20491640), (2, 10245820), (4, 5122910), (5, 4098328), (8, 2561455), (10, 2049164), (13, 1576280), (20, 1024582), (26, 788140), (40, 512291), (52, 394070), (65, 315256), (104, 197035), (130, 157628), (157, 130520), (251, 81640), (260, 78814), (314, 65260), (502, 40820), (520, 39407), (628, 32630), (785, 26104), (1004, 20410), (1255, 16328), (1256, 16315), (1570, 13052), (2008, 10205), (2041, 10040), (2510, 8164), (3140, 6526), (3263, 6280), (4082, 5020)]