21681220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{709}}^1$

素因数の和:868

約数の個数: 48

約数和(自身を含む): 50097600

約数和(自身を除く): 28416380

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 139, 220, 278, 556, 695, 709, 1390, 1418, 1529, 2780, 2836, 3058, 3545, 6116, 7090, 7645, 7799, 14180, 15290, 15598, 30580, 31196, 38995, 77990, 98551, 155980, 197102, 394204, 492755, 985510, 1084061, 1971020, 2168122, 4336244, 5420305, 10840610, 21681220]

約数ペア:

[(1, 21681220), (2, 10840610), (4, 5420305), (5, 4336244), (10, 2168122), (11, 1971020), (20, 1084061), (22, 985510), (44, 492755), (55, 394204), (110, 197102), (139, 155980), (220, 98551), (278, 77990), (556, 38995), (695, 31196), (709, 30580), (1390, 15598), (1418, 15290), (1529, 14180), (2780, 7799), (2836, 7645), (3058, 7090), (3545, 6116)]