20821276

素因数分解:

$2^2\times 7^2\times {\mathrm{41}}^1\times {\mathrm{2591}}^1$

素因数の和:2650

約数の個数: 36

約数和(自身を含む): 43436736

約数和(自身を除く): 22615460

約数列:

[1, 2, 4, 7, 14, 28, 41, 49, 82, 98, 164, 196, 287, 574, 1148, 2009, 2591, 4018, 5182, 8036, 10364, 18137, 36274, 72548, 106231, 126959, 212462, 253918, 424924, 507836, 743617, 1487234, 2974468, 5205319, 10410638, 20821276]

約数ペア:

[(1, 20821276), (2, 10410638), (4, 5205319), (7, 2974468), (14, 1487234), (28, 743617), (41, 507836), (49, 424924), (82, 253918), (98, 212462), (164, 126959), (196, 106231), (287, 72548), (574, 36274), (1148, 18137), (2009, 10364), (2591, 8036), (4018, 5182)]