21380545

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{271}}^1\times {\mathrm{509}}^1$

素因数の和:816

約数の個数: 16

約数和(自身を含む): 26634240

約数和(自身を除く): 5253695

約数列:

[1, 5, 31, 155, 271, 509, 1355, 2545, 8401, 15779, 42005, 78895, 137939, 689695, 4276109, 21380545]

約数ペア:

[(1, 21380545), (5, 4276109), (31, 689695), (155, 137939), (271, 78895), (509, 42005), (1355, 15779), (2545, 8401)]