21128355

素因数分解:

$3^2\times 5^1\times {\mathrm{127}}^1\times {\mathrm{3697}}^1$

素因数の和:3835

約数の個数: 24

約数和(自身を含む): 36920832

約数和(自身を除く): 15792477

約数列:

[1, 3, 5, 9, 15, 45, 127, 381, 635, 1143, 1905, 3697, 5715, 11091, 18485, 33273, 55455, 166365, 469519, 1408557, 2347595, 4225671, 7042785, 21128355]

約数ペア:

[(1, 21128355), (3, 7042785), (5, 4225671), (9, 2347595), (15, 1408557), (45, 469519), (127, 166365), (381, 55455), (635, 33273), (1143, 18485), (1905, 11091), (3697, 5715)]