20211765

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{257}}^1$

素因数の和:386

約数の個数: 48

約数和(自身を含む): 38117952

約数和(自身を除く): 17906187

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 107, 147, 245, 257, 321, 535, 735, 749, 771, 1285, 1605, 1799, 2247, 3745, 3855, 5243, 5397, 8995, 11235, 12593, 15729, 26215, 26985, 27499, 37779, 62965, 78645, 82497, 137495, 188895, 192493, 412485, 577479, 962465, 1347451, 2887395, 4042353, 6737255, 20211765]

約数ペア:

[(1, 20211765), (3, 6737255), (5, 4042353), (7, 2887395), (15, 1347451), (21, 962465), (35, 577479), (49, 412485), (105, 192493), (107, 188895), (147, 137495), (245, 82497), (257, 78645), (321, 62965), (535, 37779), (735, 27499), (749, 26985), (771, 26215), (1285, 15729), (1605, 12593), (1799, 11235), (2247, 8995), (3745, 5397), (3855, 5243)]