21210705

素因数分解:

$3^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{3391}}^1$

素因数の和:3541

約数の個数: 24

約数和(自身を含む): 37040640

約数和(自身を除く): 15829935

約数列:

[1, 3, 5, 9, 15, 45, 139, 417, 695, 1251, 2085, 3391, 6255, 10173, 16955, 30519, 50865, 152595, 471349, 1414047, 2356745, 4242141, 7070235, 21210705]

約数ペア:

[(1, 21210705), (3, 7070235), (5, 4242141), (9, 2356745), (15, 1414047), (45, 471349), (139, 152595), (417, 50865), (695, 30519), (1251, 16955), (2085, 10173), (3391, 6255)]