21315175

素因数分解:

$5^2\times 7^1\times {\mathrm{349}}^2$

素因数の和:715

約数の個数: 18

約数和(自身を含む): 30293448

約数和(自身を除く): 8978273

約数列:

[1, 5, 7, 25, 35, 175, 349, 1745, 2443, 8725, 12215, 61075, 121801, 609005, 852607, 3045025, 4263035, 21315175]

約数ペア:

[(1, 21315175), (5, 4263035), (7, 3045025), (25, 852607), (35, 609005), (175, 121801), (349, 61075), (1745, 12215), (2443, 8725)]