21389265

素因数分解:

$3^4\times 5^1\times {\mathrm{52813}}^1$

素因数の和:52830

約数の個数: 20

約数和(自身を含む): 38342964

約数和(自身を除く): 16953699

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52813, 158439, 264065, 475317, 792195, 1425951, 2376585, 4277853, 7129755, 21389265]

約数ペア:

[(1, 21389265), (3, 7129755), (5, 4277853), (9, 2376585), (15, 1425951), (27, 792195), (45, 475317), (81, 264065), (135, 158439), (405, 52813)]