21215915

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{181}}^1\times {\mathrm{197}}^1$

素因数の和:407

約数の個数: 32

約数和(自身を含む): 31135104

約数和(自身を除く): 9919189

約数列:

[1, 5, 7, 17, 35, 85, 119, 181, 197, 595, 905, 985, 1267, 1379, 3077, 3349, 6335, 6895, 15385, 16745, 21539, 23443, 35657, 107695, 117215, 178285, 249599, 606169, 1247995, 3030845, 4243183, 21215915]

約数ペア:

[(1, 21215915), (5, 4243183), (7, 3030845), (17, 1247995), (35, 606169), (85, 249599), (119, 178285), (181, 117215), (197, 107695), (595, 35657), (905, 23443), (985, 21539), (1267, 16745), (1379, 15385), (3077, 6895), (3349, 6335)]