21989410

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{30971}}^1$

素因数の和:31049

約数の個数: 16

約数和(自身を含む): 40139712

約数和(自身を除く): 18150302

約数列:

[1, 2, 5, 10, 71, 142, 355, 710, 30971, 61942, 154855, 309710, 2198941, 4397882, 10994705, 21989410]

約数ペア:

[(1, 21989410), (2, 10994705), (5, 4397882), (10, 2198941), (71, 309710), (142, 154855), (355, 61942), (710, 30971)]