21728975

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1$

素因数の和:140

約数の個数: 48

約数和(自身を含む): 30935520

約数和(自身を除く): 9206545

約数列:

[1, 5, 17, 25, 29, 41, 43, 85, 145, 205, 215, 425, 493, 697, 725, 731, 1025, 1075, 1189, 1247, 1763, 2465, 3485, 3655, 5945, 6235, 8815, 12325, 17425, 18275, 20213, 21199, 29725, 29971, 31175, 44075, 51127, 101065, 105995, 149855, 255635, 505325, 529975, 749275, 869159, 1278175, 4345795, 21728975]

約数ペア:

[(1, 21728975), (5, 4345795), (17, 1278175), (25, 869159), (29, 749275), (41, 529975), (43, 505325), (85, 255635), (145, 149855), (205, 105995), (215, 101065), (425, 51127), (493, 44075), (697, 31175), (725, 29971), (731, 29725), (1025, 21199), (1075, 20213), (1189, 18275), (1247, 17425), (1763, 12325), (2465, 8815), (3485, 6235), (3655, 5945)]