21080045

素因数分解:

$5^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{619}}^1$

素因数の和:777

約数の個数: 24

約数和(自身を含む): 29685600

約数和(自身を除く): 8605555

約数列:

[1, 5, 7, 35, 49, 139, 245, 619, 695, 973, 3095, 4333, 4865, 6811, 21665, 30331, 34055, 86041, 151655, 430205, 602287, 3011435, 4216009, 21080045]

約数ペア:

[(1, 21080045), (5, 4216009), (7, 3011435), (35, 602287), (49, 430205), (139, 151655), (245, 86041), (619, 34055), (695, 30331), (973, 21665), (3095, 6811), (4333, 4865)]