21020505

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{191}}^1$

素因数の和:262

約数の個数: 64

約数和(自身を含む): 39813120

約数和(自身を除く): 18792615

約数列:

[1, 3, 5, 11, 15, 23, 29, 33, 55, 69, 87, 115, 145, 165, 191, 253, 319, 345, 435, 573, 667, 759, 955, 957, 1265, 1595, 2001, 2101, 2865, 3335, 3795, 4393, 4785, 5539, 6303, 7337, 10005, 10505, 13179, 16617, 21965, 22011, 27695, 31515, 36685, 48323, 60929, 65895, 83085, 110055, 127397, 144969, 182787, 241615, 304645, 382191, 636985, 724845, 913935, 1401367, 1910955, 4204101, 7006835, 21020505]

約数ペア:

[(1, 21020505), (3, 7006835), (5, 4204101), (11, 1910955), (15, 1401367), (23, 913935), (29, 724845), (33, 636985), (55, 382191), (69, 304645), (87, 241615), (115, 182787), (145, 144969), (165, 127397), (191, 110055), (253, 83085), (319, 65895), (345, 60929), (435, 48323), (573, 36685), (667, 31515), (759, 27695), (955, 22011), (957, 21965), (1265, 16617), (1595, 13179), (2001, 10505), (2101, 10005), (2865, 7337), (3335, 6303), (3795, 5539), (4393, 4785)]