21781251

素因数分解:

$3^3\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{491}}^1$

素因数の和:584

約数の個数: 32

約数和(自身を含む): 34007040

約数和(自身を除く): 12225789

約数列:

[1, 3, 9, 27, 31, 53, 93, 159, 279, 477, 491, 837, 1431, 1473, 1643, 4419, 4929, 13257, 14787, 15221, 26023, 44361, 45663, 78069, 136989, 234207, 410967, 702621, 806713, 2420139, 7260417, 21781251]

約数ペア:

[(1, 21781251), (3, 7260417), (9, 2420139), (27, 806713), (31, 702621), (53, 410967), (93, 234207), (159, 136989), (279, 78069), (477, 45663), (491, 44361), (837, 26023), (1431, 15221), (1473, 14787), (1643, 13257), (4419, 4929)]