21356365

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{211}}^1\times {\mathrm{653}}^1$

素因数の和:900

約数の個数: 16

約数和(自身を含む): 26620416

約数和(自身を除く): 5264051

約数列:

[1, 5, 31, 155, 211, 653, 1055, 3265, 6541, 20243, 32705, 101215, 137783, 688915, 4271273, 21356365]

約数ペア:

[(1, 21356365), (5, 4271273), (31, 688915), (155, 137783), (211, 101215), (653, 32705), (1055, 20243), (3265, 6541)]