20278570

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{389}}^1\times {\mathrm{401}}^1$

素因数の和:810

約数の個数: 32

約数和(自身を含む): 39508560

約数和(自身を除く): 19229990

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 389, 401, 778, 802, 1945, 2005, 3890, 4010, 5057, 5213, 10114, 10426, 25285, 26065, 50570, 52130, 155989, 311978, 779945, 1559890, 2027857, 4055714, 10139285, 20278570]

約数ペア:

[(1, 20278570), (2, 10139285), (5, 4055714), (10, 2027857), (13, 1559890), (26, 779945), (65, 311978), (130, 155989), (389, 52130), (401, 50570), (778, 26065), (802, 25285), (1945, 10426), (2005, 10114), (3890, 5213), (4010, 5057)]