21352880

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2999}}^1$

素因数の和:3101

約数の個数: 40

約数和(自身を含む): 50220000

約数和(自身を除く): 28867120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2999, 3560, 5998, 7120, 11996, 14995, 23992, 29990, 47984, 59980, 119960, 239920, 266911, 533822, 1067644, 1334555, 2135288, 2669110, 4270576, 5338220, 10676440, 21352880]

約数ペア:

[(1, 21352880), (2, 10676440), (4, 5338220), (5, 4270576), (8, 2669110), (10, 2135288), (16, 1334555), (20, 1067644), (40, 533822), (80, 266911), (89, 239920), (178, 119960), (356, 59980), (445, 47984), (712, 29990), (890, 23992), (1424, 14995), (1780, 11996), (2999, 7120), (3560, 5998)]