21090640

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6131}}^1$

素因数の和:6187

約数の個数: 40

約数和(自身を含む): 50184288

約数和(自身を除く): 29093648

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6131, 12262, 24524, 30655, 49048, 61310, 98096, 122620, 245240, 263633, 490480, 527266, 1054532, 1318165, 2109064, 2636330, 4218128, 5272660, 10545320, 21090640]

約数ペア:

[(1, 21090640), (2, 10545320), (4, 5272660), (5, 4218128), (8, 2636330), (10, 2109064), (16, 1318165), (20, 1054532), (40, 527266), (43, 490480), (80, 263633), (86, 245240), (172, 122620), (215, 98096), (344, 61310), (430, 49048), (688, 30655), (860, 24524), (1720, 12262), (3440, 6131)]