20439280

素因数分解:

$2^4\times 5^1\times {\mathrm{239}}^1\times {\mathrm{1069}}^1$

素因数の和:1321

約数の個数: 40

約数和(自身を含む): 47764800

約数和(自身を除く): 27325520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 239, 478, 956, 1069, 1195, 1912, 2138, 2390, 3824, 4276, 4780, 5345, 8552, 9560, 10690, 17104, 19120, 21380, 42760, 85520, 255491, 510982, 1021964, 1277455, 2043928, 2554910, 4087856, 5109820, 10219640, 20439280]

約数ペア:

[(1, 20439280), (2, 10219640), (4, 5109820), (5, 4087856), (8, 2554910), (10, 2043928), (16, 1277455), (20, 1021964), (40, 510982), (80, 255491), (239, 85520), (478, 42760), (956, 21380), (1069, 19120), (1195, 17104), (1912, 10690), (2138, 9560), (2390, 8552), (3824, 5345), (4276, 4780)]