21082780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{509}}^1$

素因数の和:646

約数の個数: 48

約数和(自身を含む): 47124000

約数和(自身を除く): 26041220

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 109, 190, 218, 380, 436, 509, 545, 1018, 1090, 2036, 2071, 2180, 2545, 4142, 5090, 8284, 9671, 10180, 10355, 19342, 20710, 38684, 41420, 48355, 55481, 96710, 110962, 193420, 221924, 277405, 554810, 1054139, 1109620, 2108278, 4216556, 5270695, 10541390, 21082780]

約数ペア:

[(1, 21082780), (2, 10541390), (4, 5270695), (5, 4216556), (10, 2108278), (19, 1109620), (20, 1054139), (38, 554810), (76, 277405), (95, 221924), (109, 193420), (190, 110962), (218, 96710), (380, 55481), (436, 48355), (509, 41420), (545, 38684), (1018, 20710), (1090, 19342), (2036, 10355), (2071, 10180), (2180, 9671), (2545, 8284), (4142, 5090)]