20717865

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{739}}^1$

素因数の和:846

約数の個数: 48

約数和(自身を含む): 41558400

約数和(自身を除く): 20840535

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 89, 105, 267, 315, 445, 623, 739, 801, 1335, 1869, 2217, 3115, 3695, 4005, 5173, 5607, 6651, 9345, 11085, 15519, 25865, 28035, 33255, 46557, 65771, 77595, 197313, 232785, 328855, 460397, 591939, 986565, 1381191, 2301985, 2959695, 4143573, 6905955, 20717865]

約数ペア:

[(1, 20717865), (3, 6905955), (5, 4143573), (7, 2959695), (9, 2301985), (15, 1381191), (21, 986565), (35, 591939), (45, 460397), (63, 328855), (89, 232785), (105, 197313), (267, 77595), (315, 65771), (445, 46557), (623, 33255), (739, 28035), (801, 25865), (1335, 15519), (1869, 11085), (2217, 9345), (3115, 6651), (3695, 5607), (4005, 5173)]