21424340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{199}}^1\times {\mathrm{769}}^1$

素因数の和:984

約数の個数: 48

約数和(自身を含む): 51744000

約数和(自身を除く): 30319660

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 199, 398, 769, 796, 995, 1393, 1538, 1990, 2786, 3076, 3845, 3980, 5383, 5572, 6965, 7690, 10766, 13930, 15380, 21532, 26915, 27860, 53830, 107660, 153031, 306062, 612124, 765155, 1071217, 1530310, 2142434, 3060620, 4284868, 5356085, 10712170, 21424340]

約数ペア:

[(1, 21424340), (2, 10712170), (4, 5356085), (5, 4284868), (7, 3060620), (10, 2142434), (14, 1530310), (20, 1071217), (28, 765155), (35, 612124), (70, 306062), (140, 153031), (199, 107660), (398, 53830), (769, 27860), (796, 26915), (995, 21532), (1393, 15380), (1538, 13930), (1990, 10766), (2786, 7690), (3076, 6965), (3845, 5572), (3980, 5383)]