21286925

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{227}}^1$

素因数の和:290

約数の個数: 36

約数和(自身を含む): 30081408

約数和(自身を除く): 8794483

約数列:

[1, 5, 11, 25, 31, 55, 121, 155, 227, 275, 341, 605, 775, 1135, 1705, 2497, 3025, 3751, 5675, 7037, 8525, 12485, 18755, 27467, 35185, 62425, 77407, 93775, 137335, 175925, 387035, 686675, 851477, 1935175, 4257385, 21286925]

約数ペア:

[(1, 21286925), (5, 4257385), (11, 1935175), (25, 851477), (31, 686675), (55, 387035), (121, 175925), (155, 137335), (227, 93775), (275, 77407), (341, 62425), (605, 35185), (775, 27467), (1135, 18755), (1705, 12485), (2497, 8525), (3025, 7037), (3751, 5675)]