21917140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{1759}}^1$

素因数の和:1864

約数の個数: 48

約数和(自身を含む): 53222400

約数和(自身を除く): 31305260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 89, 140, 178, 356, 445, 623, 890, 1246, 1759, 1780, 2492, 3115, 3518, 6230, 7036, 8795, 12313, 12460, 17590, 24626, 35180, 49252, 61565, 123130, 156551, 246260, 313102, 626204, 782755, 1095857, 1565510, 2191714, 3131020, 4383428, 5479285, 10958570, 21917140]

約数ペア:

[(1, 21917140), (2, 10958570), (4, 5479285), (5, 4383428), (7, 3131020), (10, 2191714), (14, 1565510), (20, 1095857), (28, 782755), (35, 626204), (70, 313102), (89, 246260), (140, 156551), (178, 123130), (356, 61565), (445, 49252), (623, 35180), (890, 24626), (1246, 17590), (1759, 12460), (1780, 12313), (2492, 8795), (3115, 7036), (3518, 6230)]