21020019

素因数分解:

$3^1\times {\mathrm{101}}^1\times {\mathrm{173}}^1\times {\mathrm{401}}^1$

素因数の和:678

約数の個数: 16

約数和(自身を含む): 28538784

約数和(自身を除く): 7518765

約数列:

[1, 3, 101, 173, 303, 401, 519, 1203, 17473, 40501, 52419, 69373, 121503, 208119, 7006673, 21020019]

約数ペア:

[(1, 21020019), (3, 7006673), (101, 208119), (173, 121503), (303, 69373), (401, 52419), (519, 40501), (1203, 17473)]