21036640

素因数分解:

$2^5\times 5^1\times {\mathrm{131479}}^1$

素因数の和:131494

約数の個数: 24

約数和(自身を含む): 49699440

約数和(自身を除く): 28662800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 131479, 262958, 525916, 657395, 1051832, 1314790, 2103664, 2629580, 4207328, 5259160, 10518320, 21036640]

約数ペア:

[(1, 21036640), (2, 10518320), (4, 5259160), (5, 4207328), (8, 2629580), (10, 2103664), (16, 1314790), (20, 1051832), (32, 657395), (40, 525916), (80, 262958), (160, 131479)]