640700

素因数分解:

$2^2\times 5^2\times {\mathrm{43}}^1\times {\mathrm{149}}^1$

素因数の和:206

約数の個数: 36

約数和(自身を含む): 1432200

約数和(自身を除く): 791500

約数列:

[1, 2, 4, 5, 10, 20, 25, 43, 50, 86, 100, 149, 172, 215, 298, 430, 596, 745, 860, 1075, 1490, 2150, 2980, 3725, 4300, 6407, 7450, 12814, 14900, 25628, 32035, 64070, 128140, 160175, 320350, 640700]

約数ペア:

[(1, 640700), (2, 320350), (4, 160175), (5, 128140), (10, 64070), (20, 32035), (25, 25628), (43, 14900), (50, 12814), (86, 7450), (100, 6407), (149, 4300), (172, 3725), (215, 2980), (298, 2150), (430, 1490), (596, 1075), (745, 860)]