21538840

素因数分解:

$2^3\times 5^1\times {\mathrm{538471}}^1$

素因数の和:538482

約数の個数: 16

約数和(自身を含む): 48462480

約数和(自身を除く): 26923640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 538471, 1076942, 2153884, 2692355, 4307768, 5384710, 10769420, 21538840]

約数ペア:

[(1, 21538840), (2, 10769420), (4, 5384710), (5, 4307768), (8, 2692355), (10, 2153884), (20, 1076942), (40, 538471)]