20971965

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{379}}^1$

素因数の和:442

約数の個数: 64

約数和(自身を含む): 42024960

約数和(自身を除く): 21052995

約数列:

[1, 3, 5, 7, 15, 17, 21, 31, 35, 51, 85, 93, 105, 119, 155, 217, 255, 357, 379, 465, 527, 595, 651, 1085, 1137, 1581, 1785, 1895, 2635, 2653, 3255, 3689, 5685, 6443, 7905, 7959, 11067, 11749, 13265, 18445, 19329, 32215, 35247, 39795, 45101, 55335, 58745, 82243, 96645, 135303, 176235, 199733, 225505, 246729, 411215, 599199, 676515, 998665, 1233645, 1398131, 2995995, 4194393, 6990655, 20971965]

約数ペア:

[(1, 20971965), (3, 6990655), (5, 4194393), (7, 2995995), (15, 1398131), (17, 1233645), (21, 998665), (31, 676515), (35, 599199), (51, 411215), (85, 246729), (93, 225505), (105, 199733), (119, 176235), (155, 135303), (217, 96645), (255, 82243), (357, 58745), (379, 55335), (465, 45101), (527, 39795), (595, 35247), (651, 32215), (1085, 19329), (1137, 18445), (1581, 13265), (1785, 11749), (1895, 11067), (2635, 7959), (2653, 7905), (3255, 6443), (3689, 5685)]