21808240

素因数分解:

$2^4\times 5^1\times {\mathrm{272603}}^1$

素因数の和:272616

約数の個数: 20

約数和(自身を含む): 50704344

約数和(自身を除く): 28896104

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272603, 545206, 1090412, 1363015, 2180824, 2726030, 4361648, 5452060, 10904120, 21808240]

約数ペア:

[(1, 21808240), (2, 10904120), (4, 5452060), (5, 4361648), (8, 2726030), (10, 2180824), (16, 1363015), (20, 1090412), (40, 545206), (80, 272603)]