21941840

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3863}}^1$

素因数の和:3947

約数の個数: 40

約数和(自身を含む): 51746688

約数和(自身を除く): 29804848

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3863, 5680, 7726, 15452, 19315, 30904, 38630, 61808, 77260, 154520, 274273, 309040, 548546, 1097092, 1371365, 2194184, 2742730, 4388368, 5485460, 10970920, 21941840]

約数ペア:

[(1, 21941840), (2, 10970920), (4, 5485460), (5, 4388368), (8, 2742730), (10, 2194184), (16, 1371365), (20, 1097092), (40, 548546), (71, 309040), (80, 274273), (142, 154520), (284, 77260), (355, 61808), (568, 38630), (710, 30904), (1136, 19315), (1420, 15452), (2840, 7726), (3863, 5680)]