21397275

素因数分解:

$3^2\times 5^2\times {\mathrm{61}}^1\times {\mathrm{1559}}^1$

素因数の和:1636

約数の個数: 36

約数和(自身を含む): 38978160

約数和(自身を除く): 17580885

約数列:

[1, 3, 5, 9, 15, 25, 45, 61, 75, 183, 225, 305, 549, 915, 1525, 1559, 2745, 4575, 4677, 7795, 13725, 14031, 23385, 38975, 70155, 95099, 116925, 285297, 350775, 475495, 855891, 1426485, 2377475, 4279455, 7132425, 21397275]

約数ペア:

[(1, 21397275), (3, 7132425), (5, 4279455), (9, 2377475), (15, 1426485), (25, 855891), (45, 475495), (61, 350775), (75, 285297), (183, 116925), (225, 95099), (305, 70155), (549, 38975), (915, 23385), (1525, 14031), (1559, 13725), (2745, 7795), (4575, 4677)]