21720556

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{127}}^1$

素因数の和:191

約数の個数: 72

約数和(自身を含む): 47222784

約数和(自身を除く): 25502228

約数列:

[1, 2, 4, 11, 13, 22, 23, 26, 44, 46, 52, 92, 127, 143, 169, 253, 254, 286, 299, 338, 506, 508, 572, 598, 676, 1012, 1196, 1397, 1651, 1859, 2794, 2921, 3289, 3302, 3718, 3887, 5588, 5842, 6578, 6604, 7436, 7774, 11684, 13156, 15548, 18161, 21463, 32131, 36322, 37973, 42757, 42926, 64262, 72644, 75946, 85514, 85852, 128524, 151892, 171028, 236093, 417703, 472186, 493649, 835406, 944372, 987298, 1670812, 1974596, 5430139, 10860278, 21720556]

約数ペア:

[(1, 21720556), (2, 10860278), (4, 5430139), (11, 1974596), (13, 1670812), (22, 987298), (23, 944372), (26, 835406), (44, 493649), (46, 472186), (52, 417703), (92, 236093), (127, 171028), (143, 151892), (169, 128524), (253, 85852), (254, 85514), (286, 75946), (299, 72644), (338, 64262), (506, 42926), (508, 42757), (572, 37973), (598, 36322), (676, 32131), (1012, 21463), (1196, 18161), (1397, 15548), (1651, 13156), (1859, 11684), (2794, 7774), (2921, 7436), (3289, 6604), (3302, 6578), (3718, 5842), (3887, 5588)]