21117855

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{977}}^1$

素因数の和:1127

約数の個数: 32

約数和(自身を含む): 37179648

約数和(自身を除く): 16061793

約数列:

[1, 3, 5, 11, 15, 33, 55, 131, 165, 393, 655, 977, 1441, 1965, 2931, 4323, 4885, 7205, 10747, 14655, 21615, 32241, 53735, 127987, 161205, 383961, 639935, 1407857, 1919805, 4223571, 7039285, 21117855]

約数ペア:

[(1, 21117855), (3, 7039285), (5, 4223571), (11, 1919805), (15, 1407857), (33, 639935), (55, 383961), (131, 161205), (165, 127987), (393, 53735), (655, 32241), (977, 21615), (1441, 14655), (1965, 10747), (2931, 7205), (4323, 4885)]