720400

素因数分解:

$2^4\times 5^2\times {\mathrm{1801}}^1$

素因数の和:1819

約数の個数: 30

約数和(自身を含む): 1731722

約数和(自身を除く): 1011322

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 1801, 3602, 7204, 9005, 14408, 18010, 28816, 36020, 45025, 72040, 90050, 144080, 180100, 360200, 720400]

約数ペア:

[(1, 720400), (2, 360200), (4, 180100), (5, 144080), (8, 90050), (10, 72040), (16, 45025), (20, 36020), (25, 28816), (40, 18010), (50, 14408), (80, 9005), (100, 7204), (200, 3602), (400, 1801)]