81981520

素因数分解:

$2^4\times 5^1\times {\mathrm{569}}^1\times {\mathrm{1801}}^1$

素因数の和:2383

約数の個数: 40

約数和(自身を含む): 191048040

約数和(自身を除く): 109066520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 569, 1138, 1801, 2276, 2845, 3602, 4552, 5690, 7204, 9005, 9104, 11380, 14408, 18010, 22760, 28816, 36020, 45520, 72040, 144080, 1024769, 2049538, 4099076, 5123845, 8198152, 10247690, 16396304, 20495380, 40990760, 81981520]

約数ペア:

[(1, 81981520), (2, 40990760), (4, 20495380), (5, 16396304), (8, 10247690), (10, 8198152), (16, 5123845), (20, 4099076), (40, 2049538), (80, 1024769), (569, 144080), (1138, 72040), (1801, 45520), (2276, 36020), (2845, 28816), (3602, 22760), (4552, 18010), (5690, 14408), (7204, 11380), (9005, 9104)]