21108405

素因数分解:

$3^1\times 5^1\times {\mathrm{47}}^1\times {\mathrm{79}}^1\times {\mathrm{379}}^1$

素因数の和:513

約数の個数: 32

約数和(自身を含む): 35020800

約数和(自身を除く): 13912395

約数列:

[1, 3, 5, 15, 47, 79, 141, 235, 237, 379, 395, 705, 1137, 1185, 1895, 3713, 5685, 11139, 17813, 18565, 29941, 53439, 55695, 89065, 89823, 149705, 267195, 449115, 1407227, 4221681, 7036135, 21108405]

約数ペア:

[(1, 21108405), (3, 7036135), (5, 4221681), (15, 1407227), (47, 449115), (79, 267195), (141, 149705), (235, 89823), (237, 89065), (379, 55695), (395, 53439), (705, 29941), (1137, 18565), (1185, 17813), (1895, 11139), (3713, 5685)]