19871555

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{401}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 28133568

約数和(自身を除く): 8262013

約数列:

[1, 5, 11, 17, 53, 55, 85, 187, 265, 401, 583, 901, 935, 2005, 2915, 4411, 4505, 6817, 9911, 21253, 22055, 34085, 49555, 74987, 106265, 233783, 361301, 374935, 1168915, 1806505, 3974311, 19871555]

約数ペア:

[(1, 19871555), (5, 3974311), (11, 1806505), (17, 1168915), (53, 374935), (55, 361301), (85, 233783), (187, 106265), (265, 74987), (401, 49555), (583, 34085), (901, 22055), (935, 21253), (2005, 9911), (2915, 6817), (4411, 4505)]