21237405

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{907}}^1$

素因数の和:1145

約数の個数: 32

約数和(自身を含む): 39051264

約数和(自身を除く): 17813859

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 223, 669, 907, 1115, 1561, 2721, 3345, 4535, 4683, 6349, 7805, 13605, 19047, 23415, 31745, 95235, 202261, 606783, 1011305, 1415827, 3033915, 4247481, 7079135, 21237405]

約数ペア:

[(1, 21237405), (3, 7079135), (5, 4247481), (7, 3033915), (15, 1415827), (21, 1011305), (35, 606783), (105, 202261), (223, 95235), (669, 31745), (907, 23415), (1115, 19047), (1561, 13605), (2721, 7805), (3345, 6349), (4535, 4683)]