21690128

素因数分解:

$2^4\times {\mathrm{109}}^1\times {\mathrm{12437}}^1$

素因数の和:12554

約数の個数: 20

約数和(自身を含む): 42413580

約数和(自身を除く): 20723452

約数列:

[1, 2, 4, 8, 16, 109, 218, 436, 872, 1744, 12437, 24874, 49748, 99496, 198992, 1355633, 2711266, 5422532, 10845064, 21690128]

約数ペア:

[(1, 21690128), (2, 10845064), (4, 5422532), (8, 2711266), (16, 1355633), (109, 198992), (218, 99496), (436, 49748), (872, 24874), (1744, 12437)]