398780

素因数分解:

$2^2\times 5^1\times {\mathrm{127}}^1\times {\mathrm{157}}^1$

素因数の和:293

約数の個数: 24

約数和(自身を含む): 849408

約数和(自身を除く): 450628

約数列:

[1, 2, 4, 5, 10, 20, 127, 157, 254, 314, 508, 628, 635, 785, 1270, 1570, 2540, 3140, 19939, 39878, 79756, 99695, 199390, 398780]

約数ペア:

[(1, 398780), (2, 199390), (4, 99695), (5, 79756), (10, 39878), (20, 19939), (127, 3140), (157, 2540), (254, 1570), (314, 1270), (508, 785), (628, 635)]