21791705

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1$

素因数の和:126

約数の個数: 48

約数和(自身を含む): 31543344

約数和(自身を除く): 9751639

約数列:

[1, 5, 13, 17, 37, 41, 65, 85, 169, 185, 205, 221, 481, 533, 629, 697, 845, 1105, 1517, 2405, 2665, 2873, 3145, 3485, 6253, 6929, 7585, 8177, 9061, 14365, 19721, 25789, 31265, 34645, 40885, 45305, 98605, 106301, 117793, 128945, 256373, 335257, 531505, 588965, 1281865, 1676285, 4358341, 21791705]

約数ペア:

[(1, 21791705), (5, 4358341), (13, 1676285), (17, 1281865), (37, 588965), (41, 531505), (65, 335257), (85, 256373), (169, 128945), (185, 117793), (205, 106301), (221, 98605), (481, 45305), (533, 40885), (629, 34645), (697, 31265), (845, 25789), (1105, 19721), (1517, 14365), (2405, 9061), (2665, 8177), (2873, 7585), (3145, 6929), (3485, 6253)]