20891241

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{563}}^1$

素因数の和:626

約数の個数: 48

約数和(自身を含む): 37539840

約数和(自身を除く): 16648599

約数列:

[1, 3, 7, 9, 19, 21, 31, 57, 63, 93, 133, 171, 217, 279, 399, 563, 589, 651, 1197, 1689, 1767, 1953, 3941, 4123, 5067, 5301, 10697, 11823, 12369, 17453, 32091, 35469, 37107, 52359, 74879, 96273, 122171, 157077, 224637, 331607, 366513, 673911, 994821, 1099539, 2321249, 2984463, 6963747, 20891241]

約数ペア:

[(1, 20891241), (3, 6963747), (7, 2984463), (9, 2321249), (19, 1099539), (21, 994821), (31, 673911), (57, 366513), (63, 331607), (93, 224637), (133, 157077), (171, 122171), (217, 96273), (279, 74879), (399, 52359), (563, 37107), (589, 35469), (651, 32091), (1197, 17453), (1689, 12369), (1767, 11823), (1953, 10697), (3941, 5301), (4123, 5067)]