21988780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{127}}^1\times {\mathrm{787}}^1$

素因数の和:934

約数の個数: 48

約数和(自身を含む): 50835456

約数和(自身を除く): 28846676

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 127, 220, 254, 508, 635, 787, 1270, 1397, 1574, 2540, 2794, 3148, 3935, 5588, 6985, 7870, 8657, 13970, 15740, 17314, 27940, 34628, 43285, 86570, 99949, 173140, 199898, 399796, 499745, 999490, 1099439, 1998980, 2198878, 4397756, 5497195, 10994390, 21988780]

約数ペア:

[(1, 21988780), (2, 10994390), (4, 5497195), (5, 4397756), (10, 2198878), (11, 1998980), (20, 1099439), (22, 999490), (44, 499745), (55, 399796), (110, 199898), (127, 173140), (220, 99949), (254, 86570), (508, 43285), (635, 34628), (787, 27940), (1270, 17314), (1397, 15740), (1574, 13970), (2540, 8657), (2794, 7870), (3148, 6985), (3935, 5588)]