20781968

素因数分解:

$2^4\times {\mathrm{61}}^1\times {\mathrm{107}}^1\times {\mathrm{199}}^1$

素因数の和:375

約数の個数: 40

約数和(自身を含む): 41515200

約数和(自身を除く): 20733232

約数列:

[1, 2, 4, 8, 16, 61, 107, 122, 199, 214, 244, 398, 428, 488, 796, 856, 976, 1592, 1712, 3184, 6527, 12139, 13054, 21293, 24278, 26108, 42586, 48556, 52216, 85172, 97112, 104432, 170344, 194224, 340688, 1298873, 2597746, 5195492, 10390984, 20781968]

約数ペア:

[(1, 20781968), (2, 10390984), (4, 5195492), (8, 2597746), (16, 1298873), (61, 340688), (107, 194224), (122, 170344), (199, 104432), (214, 97112), (244, 85172), (398, 52216), (428, 48556), (488, 42586), (796, 26108), (856, 24278), (976, 21293), (1592, 13054), (1712, 12139), (3184, 6527)]