20097980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{1613}}^1$

素因数の和:1718

約数の個数: 48

約数和(自身を含む): 48807360

約数和(自身を除く): 28709380

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 89, 140, 178, 356, 445, 623, 890, 1246, 1613, 1780, 2492, 3115, 3226, 6230, 6452, 8065, 11291, 12460, 16130, 22582, 32260, 45164, 56455, 112910, 143557, 225820, 287114, 574228, 717785, 1004899, 1435570, 2009798, 2871140, 4019596, 5024495, 10048990, 20097980]

約数ペア:

[(1, 20097980), (2, 10048990), (4, 5024495), (5, 4019596), (7, 2871140), (10, 2009798), (14, 1435570), (20, 1004899), (28, 717785), (35, 574228), (70, 287114), (89, 225820), (140, 143557), (178, 112910), (356, 56455), (445, 45164), (623, 32260), (890, 22582), (1246, 16130), (1613, 12460), (1780, 11291), (2492, 8065), (3115, 6452), (3226, 6230)]