21139280

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2969}}^1$

素因数の和:3071

約数の個数: 40

約数和(自身を含む): 49717800

約数和(自身を除く): 28578520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2969, 3560, 5938, 7120, 11876, 14845, 23752, 29690, 47504, 59380, 118760, 237520, 264241, 528482, 1056964, 1321205, 2113928, 2642410, 4227856, 5284820, 10569640, 21139280]

約数ペア:

[(1, 21139280), (2, 10569640), (4, 5284820), (5, 4227856), (8, 2642410), (10, 2113928), (16, 1321205), (20, 1056964), (40, 528482), (80, 264241), (89, 237520), (178, 118760), (356, 59380), (445, 47504), (712, 29690), (890, 23752), (1424, 14845), (1780, 11876), (2969, 7120), (3560, 5938)]