20919808

素因数分解:

$2^9\times 7^1\times {\mathrm{13}}^1\times {\mathrm{449}}^1$

素因数の和:487

約数の個数: 80

約数和(自身を含む): 51559200

約数和(自身を除く): 30639392

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 32, 52, 56, 64, 91, 104, 112, 128, 182, 208, 224, 256, 364, 416, 448, 449, 512, 728, 832, 896, 898, 1456, 1664, 1792, 1796, 2912, 3143, 3328, 3584, 3592, 5824, 5837, 6286, 6656, 7184, 11648, 11674, 12572, 14368, 23296, 23348, 25144, 28736, 40859, 46592, 46696, 50288, 57472, 81718, 93392, 100576, 114944, 163436, 186784, 201152, 229888, 326872, 373568, 402304, 653744, 747136, 804608, 1307488, 1494272, 1609216, 2614976, 2988544, 5229952, 10459904, 20919808]

約数ペア:

[(1, 20919808), (2, 10459904), (4, 5229952), (7, 2988544), (8, 2614976), (13, 1609216), (14, 1494272), (16, 1307488), (26, 804608), (28, 747136), (32, 653744), (52, 402304), (56, 373568), (64, 326872), (91, 229888), (104, 201152), (112, 186784), (128, 163436), (182, 114944), (208, 100576), (224, 93392), (256, 81718), (364, 57472), (416, 50288), (448, 46696), (449, 46592), (512, 40859), (728, 28736), (832, 25144), (896, 23348), (898, 23296), (1456, 14368), (1664, 12572), (1792, 11674), (1796, 11648), (2912, 7184), (3143, 6656), (3328, 6286), (3584, 5837), (3592, 5824)]