21060405

素因数分解:

$3^4\times 5^1\times {\mathrm{149}}^1\times {\mathrm{349}}^1$

素因数の和:515

約数の個数: 40

約数和(自身を含む): 38115000

約数和(自身を除く): 17054595

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 149, 349, 405, 447, 745, 1047, 1341, 1745, 2235, 3141, 4023, 5235, 6705, 9423, 12069, 15705, 20115, 28269, 47115, 52001, 60345, 141345, 156003, 260005, 468009, 780015, 1404027, 2340045, 4212081, 7020135, 21060405]

約数ペア:

[(1, 21060405), (3, 7020135), (5, 4212081), (9, 2340045), (15, 1404027), (27, 780015), (45, 468009), (81, 260005), (135, 156003), (149, 141345), (349, 60345), (405, 52001), (447, 47115), (745, 28269), (1047, 20115), (1341, 15705), (1745, 12069), (2235, 9423), (3141, 6705), (4023, 5235)]