21557788

素因数分解:

$2^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{139}}^1\times {\mathrm{191}}^1$

素因数の和:370

約数の個数: 48

約数和(自身を含む): 45158400

約数和(自身を除く): 23600612

約数列:

[1, 2, 4, 7, 14, 28, 29, 58, 116, 139, 191, 203, 278, 382, 406, 556, 764, 812, 973, 1337, 1946, 2674, 3892, 4031, 5348, 5539, 8062, 11078, 16124, 22156, 26549, 28217, 38773, 53098, 56434, 77546, 106196, 112868, 155092, 185843, 371686, 743372, 769921, 1539842, 3079684, 5389447, 10778894, 21557788]

約数ペア:

[(1, 21557788), (2, 10778894), (4, 5389447), (7, 3079684), (14, 1539842), (28, 769921), (29, 743372), (58, 371686), (116, 185843), (139, 155092), (191, 112868), (203, 106196), (278, 77546), (382, 56434), (406, 53098), (556, 38773), (764, 28217), (812, 26549), (973, 22156), (1337, 16124), (1946, 11078), (2674, 8062), (3892, 5539), (4031, 5348)]