21920157

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{211}}^1$

素因数の和:338

約数の個数: 48

約数和(自身を含む): 38892672

約数和(自身を除く): 16972515

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 97, 119, 153, 211, 291, 357, 633, 679, 873, 1071, 1477, 1649, 1899, 2037, 3587, 4431, 4947, 6111, 10761, 11543, 13293, 14841, 20467, 25109, 32283, 34629, 61401, 75327, 103887, 143269, 184203, 225981, 347939, 429807, 1043817, 1289421, 2435573, 3131451, 7306719, 21920157]

約数ペア:

[(1, 21920157), (3, 7306719), (7, 3131451), (9, 2435573), (17, 1289421), (21, 1043817), (51, 429807), (63, 347939), (97, 225981), (119, 184203), (153, 143269), (211, 103887), (291, 75327), (357, 61401), (633, 34629), (679, 32283), (873, 25109), (1071, 20467), (1477, 14841), (1649, 13293), (1899, 11543), (2037, 10761), (3587, 6111), (4431, 4947)]