19918745

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{389}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 32011200

約数和(自身を除く): 12092455

約数列:

[1, 5, 7, 11, 19, 35, 49, 55, 77, 95, 133, 209, 245, 385, 389, 539, 665, 931, 1045, 1463, 1945, 2695, 2723, 4279, 4655, 7315, 7391, 10241, 13615, 19061, 21395, 29953, 36955, 51205, 51737, 81301, 95305, 149765, 209671, 258685, 362159, 406505, 569107, 1048355, 1810795, 2845535, 3983749, 19918745]

約数ペア:

[(1, 19918745), (5, 3983749), (7, 2845535), (11, 1810795), (19, 1048355), (35, 569107), (49, 406505), (55, 362159), (77, 258685), (95, 209671), (133, 149765), (209, 95305), (245, 81301), (385, 51737), (389, 51205), (539, 36955), (665, 29953), (931, 21395), (1045, 19061), (1463, 13615), (1945, 10241), (2695, 7391), (2723, 7315), (4279, 4655)]