257342920

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{13103}}^1$

素因数の和:13605

約数の個数: 32

約数和(自身を含む): 580245120

約数和(自身を除く): 322902200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1964, 2455, 3928, 4910, 9820, 13103, 19640, 26206, 52412, 65515, 104824, 131030, 262060, 524120, 6433573, 12867146, 25734292, 32167865, 51468584, 64335730, 128671460, 257342920]

約数ペア:

[(1, 257342920), (2, 128671460), (4, 64335730), (5, 51468584), (8, 32167865), (10, 25734292), (20, 12867146), (40, 6433573), (491, 524120), (982, 262060), (1964, 131030), (2455, 104824), (3928, 65515), (4910, 52412), (9820, 26206), (13103, 19640)]