20981216

素因数分解:

$2^5\times {\mathrm{53}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:291

約数の個数: 48

約数和(自身を含む): 42865200

約数和(自身を除く): 21883984

約数列:

[1, 2, 4, 8, 16, 32, 53, 89, 106, 139, 178, 212, 278, 356, 424, 556, 712, 848, 1112, 1424, 1696, 2224, 2848, 4448, 4717, 7367, 9434, 12371, 14734, 18868, 24742, 29468, 37736, 49484, 58936, 75472, 98968, 117872, 150944, 197936, 235744, 395872, 655663, 1311326, 2622652, 5245304, 10490608, 20981216]

約数ペア:

[(1, 20981216), (2, 10490608), (4, 5245304), (8, 2622652), (16, 1311326), (32, 655663), (53, 395872), (89, 235744), (106, 197936), (139, 150944), (178, 117872), (212, 98968), (278, 75472), (356, 58936), (424, 49484), (556, 37736), (712, 29468), (848, 24742), (1112, 18868), (1424, 14734), (1696, 12371), (2224, 9434), (2848, 7367), (4448, 4717)]