21250905

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{83}}^1\times {\mathrm{101}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 37630656

約数和(自身を除く): 16379751

約数列:

[1, 3, 5, 13, 15, 39, 65, 83, 101, 169, 195, 249, 303, 415, 505, 507, 845, 1079, 1245, 1313, 1515, 2535, 3237, 3939, 5395, 6565, 8383, 14027, 16185, 17069, 19695, 25149, 41915, 42081, 51207, 70135, 85345, 108979, 125745, 210405, 256035, 326937, 544895, 1416727, 1634685, 4250181, 7083635, 21250905]

約数ペア:

[(1, 21250905), (3, 7083635), (5, 4250181), (13, 1634685), (15, 1416727), (39, 544895), (65, 326937), (83, 256035), (101, 210405), (169, 125745), (195, 108979), (249, 85345), (303, 70135), (415, 51207), (505, 42081), (507, 41915), (845, 25149), (1079, 19695), (1245, 17069), (1313, 16185), (1515, 14027), (2535, 8383), (3237, 6565), (3939, 5395)]