21406280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{859}}^1$

素因数の和:966

約数の個数: 64

約数和(自身を含む): 55728000

約数和(自身を除く): 34321720

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 89, 140, 178, 280, 356, 445, 623, 712, 859, 890, 1246, 1718, 1780, 2492, 3115, 3436, 3560, 4295, 4984, 6013, 6230, 6872, 8590, 12026, 12460, 17180, 24052, 24920, 30065, 34360, 48104, 60130, 76451, 120260, 152902, 240520, 305804, 382255, 535157, 611608, 764510, 1070314, 1529020, 2140628, 2675785, 3058040, 4281256, 5351570, 10703140, 21406280]

約数ペア:

[(1, 21406280), (2, 10703140), (4, 5351570), (5, 4281256), (7, 3058040), (8, 2675785), (10, 2140628), (14, 1529020), (20, 1070314), (28, 764510), (35, 611608), (40, 535157), (56, 382255), (70, 305804), (89, 240520), (140, 152902), (178, 120260), (280, 76451), (356, 60130), (445, 48104), (623, 34360), (712, 30065), (859, 24920), (890, 24052), (1246, 17180), (1718, 12460), (1780, 12026), (2492, 8590), (3115, 6872), (3436, 6230), (3560, 6013), (4295, 4984)]