638780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^2$

素因数の和:110

約数の個数: 36

約数和(自身を含む): 1447320

約数和(自身を除く): 808540

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 41, 76, 82, 95, 164, 190, 205, 380, 410, 779, 820, 1558, 1681, 3116, 3362, 3895, 6724, 7790, 8405, 15580, 16810, 31939, 33620, 63878, 127756, 159695, 319390, 638780]

約数ペア:

[(1, 638780), (2, 319390), (4, 159695), (5, 127756), (10, 63878), (19, 33620), (20, 31939), (38, 16810), (41, 15580), (76, 8405), (82, 7790), (95, 6724), (164, 3895), (190, 3362), (205, 3116), (380, 1681), (410, 1558), (779, 820)]