21189905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{131}}^1\times {\mathrm{173}}^1$

素因数の和:337

約数の個数: 32

約数和(自身を含む): 29766528

約数和(自身を除く): 8576623

約数列:

[1, 5, 11, 17, 55, 85, 131, 173, 187, 655, 865, 935, 1441, 1903, 2227, 2941, 7205, 9515, 11135, 14705, 22663, 24497, 32351, 113315, 122485, 161755, 249293, 385271, 1246465, 1926355, 4237981, 21189905]

約数ペア:

[(1, 21189905), (5, 4237981), (11, 1926355), (17, 1246465), (55, 385271), (85, 249293), (131, 161755), (173, 122485), (187, 113315), (655, 32351), (865, 24497), (935, 22663), (1441, 14705), (1903, 11135), (2227, 9515), (2941, 7205)]