21989655

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{281}}^1$

素因数の和:376

約数の個数: 48

約数和(自身を含む): 40120704

約数和(自身を除く): 18131049

約数列:

[1, 3, 5, 9, 15, 37, 45, 47, 111, 141, 185, 235, 281, 333, 423, 555, 705, 843, 1405, 1665, 1739, 2115, 2529, 4215, 5217, 8695, 10397, 12645, 13207, 15651, 26085, 31191, 39621, 51985, 66035, 78255, 93573, 118863, 155955, 198105, 467865, 488659, 594315, 1465977, 2443295, 4397931, 7329885, 21989655]

約数ペア:

[(1, 21989655), (3, 7329885), (5, 4397931), (9, 2443295), (15, 1465977), (37, 594315), (45, 488659), (47, 467865), (111, 198105), (141, 155955), (185, 118863), (235, 93573), (281, 78255), (333, 66035), (423, 51985), (555, 39621), (705, 31191), (843, 26085), (1405, 15651), (1665, 13207), (1739, 12645), (2115, 10397), (2529, 8695), (4215, 5217)]