21147075

素因数分解:

$3^5\times 5^2\times {\mathrm{59}}^2$

素因数の和:143

約数の個数: 54

約数和(自身を含む): 39956644

約数和(自身を除く): 18809569

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 59, 75, 81, 135, 177, 225, 243, 295, 405, 531, 675, 885, 1215, 1475, 1593, 2025, 2655, 3481, 4425, 4779, 6075, 7965, 10443, 13275, 14337, 17405, 23895, 31329, 39825, 52215, 71685, 87025, 93987, 119475, 156645, 261075, 281961, 358425, 469935, 783225, 845883, 1409805, 2349675, 4229415, 7049025, 21147075]

約数ペア:

[(1, 21147075), (3, 7049025), (5, 4229415), (9, 2349675), (15, 1409805), (25, 845883), (27, 783225), (45, 469935), (59, 358425), (75, 281961), (81, 261075), (135, 156645), (177, 119475), (225, 93987), (243, 87025), (295, 71685), (405, 52215), (531, 39825), (675, 31329), (885, 23895), (1215, 17405), (1475, 14337), (1593, 13275), (2025, 10443), (2655, 7965), (3481, 6075), (4425, 4779)]