21740080

素因数分解:

$2^4\times 5^1\times {\mathrm{331}}^1\times {\mathrm{821}}^1$

素因数の和:1165

約数の個数: 40

約数和(自身を含む): 50760144

約数和(自身を除く): 29020064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 331, 662, 821, 1324, 1642, 1655, 2648, 3284, 3310, 4105, 5296, 6568, 6620, 8210, 13136, 13240, 16420, 26480, 32840, 65680, 271751, 543502, 1087004, 1358755, 2174008, 2717510, 4348016, 5435020, 10870040, 21740080]

約数ペア:

[(1, 21740080), (2, 10870040), (4, 5435020), (5, 4348016), (8, 2717510), (10, 2174008), (16, 1358755), (20, 1087004), (40, 543502), (80, 271751), (331, 65680), (662, 32840), (821, 26480), (1324, 16420), (1642, 13240), (1655, 13136), (2648, 8210), (3284, 6620), (3310, 6568), (4105, 5296)]