21116305

素因数分解:

$5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{1091}}^1$

素因数の和:1189

約数の個数: 24

約数和(自身を含む): 29877120

約数和(自身を除く): 8760815

約数列:

[1, 5, 7, 35, 49, 79, 245, 395, 553, 1091, 2765, 3871, 5455, 7637, 19355, 38185, 53459, 86189, 267295, 430945, 603323, 3016615, 4223261, 21116305]

約数ペア:

[(1, 21116305), (5, 4223261), (7, 3016615), (35, 603323), (49, 430945), (79, 267295), (245, 86189), (395, 53459), (553, 38185), (1091, 19355), (2765, 7637), (3871, 5455)]