21851965

素因数分解:

$5^1\times {\mathrm{103}}^1\times {\mathrm{151}}^1\times {\mathrm{281}}^1$

素因数の和:540

約数の個数: 16

約数和(自身を含む): 26747136

約数和(自身を除く): 4895171

約数列:

[1, 5, 103, 151, 281, 515, 755, 1405, 15553, 28943, 42431, 77765, 144715, 212155, 4370393, 21851965]

約数ペア:

[(1, 21851965), (5, 4370393), (103, 212155), (151, 144715), (281, 77765), (515, 42431), (755, 28943), (1405, 15553)]