21218925

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{3109}}^1$

素因数の和:3142

約数の個数: 48

約数和(自身を含む): 43191680

約数和(自身を除く): 21972755

約数列:

[1, 3, 5, 7, 13, 15, 21, 25, 35, 39, 65, 75, 91, 105, 175, 195, 273, 325, 455, 525, 975, 1365, 2275, 3109, 6825, 9327, 15545, 21763, 40417, 46635, 65289, 77725, 108815, 121251, 202085, 233175, 282919, 326445, 544075, 606255, 848757, 1010425, 1414595, 1632225, 3031275, 4243785, 7072975, 21218925]

約数ペア:

[(1, 21218925), (3, 7072975), (5, 4243785), (7, 3031275), (13, 1632225), (15, 1414595), (21, 1010425), (25, 848757), (35, 606255), (39, 544075), (65, 326445), (75, 282919), (91, 233175), (105, 202085), (175, 121251), (195, 108815), (273, 77725), (325, 65289), (455, 46635), (525, 40417), (975, 21763), (1365, 15545), (2275, 9327), (3109, 6825)]