20961220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{73}}^1\times {\mathrm{293}}^1$

素因数の和:389

約数の個数: 72

約数和(自身を含む): 52083864

約数和(自身を除く): 31122644

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 73, 98, 140, 146, 196, 245, 292, 293, 365, 490, 511, 586, 730, 980, 1022, 1172, 1460, 1465, 2044, 2051, 2555, 2930, 3577, 4102, 5110, 5860, 7154, 8204, 10220, 10255, 14308, 14357, 17885, 20510, 21389, 28714, 35770, 41020, 42778, 57428, 71540, 71785, 85556, 106945, 143570, 149723, 213890, 287140, 299446, 427780, 598892, 748615, 1048061, 1497230, 2096122, 2994460, 4192244, 5240305, 10480610, 20961220]

約数ペア:

[(1, 20961220), (2, 10480610), (4, 5240305), (5, 4192244), (7, 2994460), (10, 2096122), (14, 1497230), (20, 1048061), (28, 748615), (35, 598892), (49, 427780), (70, 299446), (73, 287140), (98, 213890), (140, 149723), (146, 143570), (196, 106945), (245, 85556), (292, 71785), (293, 71540), (365, 57428), (490, 42778), (511, 41020), (586, 35770), (730, 28714), (980, 21389), (1022, 20510), (1172, 17885), (1460, 14357), (1465, 14308), (2044, 10255), (2051, 10220), (2555, 8204), (2930, 7154), (3577, 5860), (4102, 5110)]