81504980

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{157}}^1\times {\mathrm{257}}^1$

素因数の和:524

約数の個数: 48

約数和(自身を含む): 174632976

約数和(自身を除く): 93127996

約数列:

[1, 2, 4, 5, 10, 20, 101, 157, 202, 257, 314, 404, 505, 514, 628, 785, 1010, 1028, 1285, 1570, 2020, 2570, 3140, 5140, 15857, 25957, 31714, 40349, 51914, 63428, 79285, 80698, 103828, 129785, 158570, 161396, 201745, 259570, 317140, 403490, 519140, 806980, 4075249, 8150498, 16300996, 20376245, 40752490, 81504980]

約数ペア:

[(1, 81504980), (2, 40752490), (4, 20376245), (5, 16300996), (10, 8150498), (20, 4075249), (101, 806980), (157, 519140), (202, 403490), (257, 317140), (314, 259570), (404, 201745), (505, 161396), (514, 158570), (628, 129785), (785, 103828), (1010, 80698), (1028, 79285), (1285, 63428), (1570, 51914), (2020, 40349), (2570, 31714), (3140, 25957), (5140, 15857)]