21281810

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^2$

素因数の和:207

約数の個数: 48

約数和(自身を含む): 43690752

約数和(自身を除く): 22408942

約数列:

[1, 2, 5, 10, 11, 22, 31, 55, 62, 79, 110, 155, 158, 310, 341, 395, 682, 790, 869, 1705, 1738, 2449, 3410, 4345, 4898, 6241, 8690, 12245, 12482, 24490, 26939, 31205, 53878, 62410, 68651, 134695, 137302, 193471, 269390, 343255, 386942, 686510, 967355, 1934710, 2128181, 4256362, 10640905, 21281810]

約数ペア:

[(1, 21281810), (2, 10640905), (5, 4256362), (10, 2128181), (11, 1934710), (22, 967355), (31, 686510), (55, 386942), (62, 343255), (79, 269390), (110, 193471), (155, 137302), (158, 134695), (310, 68651), (341, 62410), (395, 53878), (682, 31205), (790, 26939), (869, 24490), (1705, 12482), (1738, 12245), (2449, 8690), (3410, 6241), (4345, 4898)]