21172725

素因数分解:

$3^3\times 5^2\times 7^1\times {\mathrm{4481}}^1$

素因数の和:4507

約数の個数: 48

約数和(自身を含む): 44461440

約数和(自身を除く): 23288715

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 27, 35, 45, 63, 75, 105, 135, 175, 189, 225, 315, 525, 675, 945, 1575, 4481, 4725, 13443, 22405, 31367, 40329, 67215, 94101, 112025, 120987, 156835, 201645, 282303, 336075, 470505, 604935, 784175, 846909, 1008225, 1411515, 2352525, 3024675, 4234545, 7057575, 21172725]

約数ペア:

[(1, 21172725), (3, 7057575), (5, 4234545), (7, 3024675), (9, 2352525), (15, 1411515), (21, 1008225), (25, 846909), (27, 784175), (35, 604935), (45, 470505), (63, 336075), (75, 282303), (105, 201645), (135, 156835), (175, 120987), (189, 112025), (225, 94101), (315, 67215), (525, 40329), (675, 31367), (945, 22405), (1575, 13443), (4481, 4725)]