21880495

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{2531}}^1$

素因数の和:2575

約数の個数: 32

約数和(自身を含む): 34030080

約数和(自身を除く): 12149585

約数列:

[1, 5, 7, 13, 19, 35, 65, 91, 95, 133, 247, 455, 665, 1235, 1729, 2531, 8645, 12655, 17717, 32903, 48089, 88585, 164515, 230321, 240445, 336623, 625157, 1151605, 1683115, 3125785, 4376099, 21880495]

約数ペア:

[(1, 21880495), (5, 4376099), (7, 3125785), (13, 1683115), (19, 1151605), (35, 625157), (65, 336623), (91, 240445), (95, 230321), (133, 164515), (247, 88585), (455, 48089), (665, 32903), (1235, 17717), (1729, 12655), (2531, 8645)]