21318320

素因数分解:

$2^4\times 5^1\times {\mathrm{266479}}^1$

素因数の和:266492

約数の個数: 20

約数和(自身を含む): 49565280

約数和(自身を除く): 28246960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266479, 532958, 1065916, 1332395, 2131832, 2664790, 4263664, 5329580, 10659160, 21318320]

約数ペア:

[(1, 21318320), (2, 10659160), (4, 5329580), (5, 4263664), (8, 2664790), (10, 2131832), (16, 1332395), (20, 1065916), (40, 532958), (80, 266479)]