21691120

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{157}}^2$

素因数の和:338

約数の個数: 60

約数和(自身を含む): 55369224

約数和(自身を除く): 33678104

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 157, 176, 220, 314, 440, 628, 785, 880, 1256, 1570, 1727, 2512, 3140, 3454, 6280, 6908, 8635, 12560, 13816, 17270, 24649, 27632, 34540, 49298, 69080, 98596, 123245, 138160, 197192, 246490, 271139, 394384, 492980, 542278, 985960, 1084556, 1355695, 1971920, 2169112, 2711390, 4338224, 5422780, 10845560, 21691120]

約数ペア:

[(1, 21691120), (2, 10845560), (4, 5422780), (5, 4338224), (8, 2711390), (10, 2169112), (11, 1971920), (16, 1355695), (20, 1084556), (22, 985960), (40, 542278), (44, 492980), (55, 394384), (80, 271139), (88, 246490), (110, 197192), (157, 138160), (176, 123245), (220, 98596), (314, 69080), (440, 49298), (628, 34540), (785, 27632), (880, 24649), (1256, 17270), (1570, 13816), (1727, 12560), (2512, 8635), (3140, 6908), (3454, 6280)]