21806380

素因数分解:

$2^2\times 5^1\times {\mathrm{401}}^1\times {\mathrm{2719}}^1$

素因数の和:3129

約数の個数: 24

約数和(自身を含む): 45924480

約数和(自身を除く): 24118100

約数列:

[1, 2, 4, 5, 10, 20, 401, 802, 1604, 2005, 2719, 4010, 5438, 8020, 10876, 13595, 27190, 54380, 1090319, 2180638, 4361276, 5451595, 10903190, 21806380]

約数ペア:

[(1, 21806380), (2, 10903190), (4, 5451595), (5, 4361276), (10, 2180638), (20, 1090319), (401, 54380), (802, 27190), (1604, 13595), (2005, 10876), (2719, 8020), (4010, 5438)]