20911825

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{223}}^1$

素因数の和:286

約数の個数: 36

約数和(自身を含む): 29553664

約数和(自身を除く): 8641839

約数列:

[1, 5, 11, 25, 31, 55, 121, 155, 223, 275, 341, 605, 775, 1115, 1705, 2453, 3025, 3751, 5575, 6913, 8525, 12265, 18755, 26983, 34565, 61325, 76043, 93775, 134915, 172825, 380215, 674575, 836473, 1901075, 4182365, 20911825]

約数ペア:

[(1, 20911825), (5, 4182365), (11, 1901075), (25, 836473), (31, 674575), (55, 380215), (121, 172825), (155, 134915), (223, 93775), (275, 76043), (341, 61325), (605, 34565), (775, 26983), (1115, 18755), (1705, 12265), (2453, 8525), (3025, 6913), (3751, 5575)]