21628789

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{47}}^1\times {\mathrm{389}}^1$

素因数の和:469

約数の個数: 24

約数和(自身を含む): 27406080

約数和(自身を除く): 5777291

約数列:

[1, 7, 13, 47, 91, 169, 329, 389, 611, 1183, 2723, 4277, 5057, 7943, 18283, 35399, 55601, 65741, 127981, 237679, 460187, 1663753, 3089827, 21628789]

約数ペア:

[(1, 21628789), (7, 3089827), (13, 1663753), (47, 460187), (91, 237679), (169, 127981), (329, 65741), (389, 55601), (611, 35399), (1183, 18283), (2723, 7943), (4277, 5057)]