21005278

素因数分解:

$2^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{28309}}^1$

素因数の和:28371

約数の個数: 16

約数和(自身を含む): 36689760

約数和(自身を除く): 15684482

約数列:

[1, 2, 7, 14, 53, 106, 371, 742, 28309, 56618, 198163, 396326, 1500377, 3000754, 10502639, 21005278]

約数ペア:

[(1, 21005278), (2, 10502639), (7, 3000754), (14, 1500377), (53, 396326), (106, 198163), (371, 56618), (742, 28309)]