21221205

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{971}}^1$

素因数の和:1057

約数の個数: 32

約数和(自身を含む): 35831808

約数和(自身を除く): 14610603

約数列:

[1, 3, 5, 15, 31, 47, 93, 141, 155, 235, 465, 705, 971, 1457, 2913, 4371, 4855, 7285, 14565, 21855, 30101, 45637, 90303, 136911, 150505, 228185, 451515, 684555, 1414747, 4244241, 7073735, 21221205]

約数ペア:

[(1, 21221205), (3, 7073735), (5, 4244241), (15, 1414747), (31, 684555), (47, 451515), (93, 228185), (141, 150505), (155, 136911), (235, 90303), (465, 45637), (705, 30101), (971, 21855), (1457, 14565), (2913, 7285), (4371, 4855)]