21072005

素因数分解:

$5^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1\times {\mathrm{607}}^1$

素因数の和:796

約数の個数: 16

約数和(自身を含む): 26002944

約数和(自身を除く): 4930939

約数列:

[1, 5, 53, 131, 265, 607, 655, 3035, 6943, 32171, 34715, 79517, 160855, 397585, 4214401, 21072005]

約数ペア:

[(1, 21072005), (5, 4214401), (53, 397585), (131, 160855), (265, 79517), (607, 34715), (655, 32171), (3035, 6943)]