20007200

素因数分解:

$2^5\times 5^2\times {\mathrm{89}}^1\times {\mathrm{281}}^1$

素因数の和:390

約数の個数: 72

約数和(自身を含む): 49567140

約数和(自身を除く): 29559940

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 89, 100, 160, 178, 200, 281, 356, 400, 445, 562, 712, 800, 890, 1124, 1405, 1424, 1780, 2225, 2248, 2810, 2848, 3560, 4450, 4496, 5620, 7025, 7120, 8900, 8992, 11240, 14050, 14240, 17800, 22480, 25009, 28100, 35600, 44960, 50018, 56200, 71200, 100036, 112400, 125045, 200072, 224800, 250090, 400144, 500180, 625225, 800288, 1000360, 1250450, 2000720, 2500900, 4001440, 5001800, 10003600, 20007200]

約数ペア:

[(1, 20007200), (2, 10003600), (4, 5001800), (5, 4001440), (8, 2500900), (10, 2000720), (16, 1250450), (20, 1000360), (25, 800288), (32, 625225), (40, 500180), (50, 400144), (80, 250090), (89, 224800), (100, 200072), (160, 125045), (178, 112400), (200, 100036), (281, 71200), (356, 56200), (400, 50018), (445, 44960), (562, 35600), (712, 28100), (800, 25009), (890, 22480), (1124, 17800), (1405, 14240), (1424, 14050), (1780, 11240), (2225, 8992), (2248, 8900), (2810, 7120), (2848, 7025), (3560, 5620), (4450, 4496)]