21258680

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{4057}}^1$

素因数の和:4199

約数の個数: 32

約数和(自身を含む): 48209040

約数和(自身を除く): 26950360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 262, 524, 655, 1048, 1310, 2620, 4057, 5240, 8114, 16228, 20285, 32456, 40570, 81140, 162280, 531467, 1062934, 2125868, 2657335, 4251736, 5314670, 10629340, 21258680]

約数ペア:

[(1, 21258680), (2, 10629340), (4, 5314670), (5, 4251736), (8, 2657335), (10, 2125868), (20, 1062934), (40, 531467), (131, 162280), (262, 81140), (524, 40570), (655, 32456), (1048, 20285), (1310, 16228), (2620, 8114), (4057, 5240)]