21820305

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{751}}^1$

素因数の和:921

約数の個数: 32

約数和(自身を含む): 37900800

約数和(自身を除く): 16080495

約数列:

[1, 3, 5, 13, 15, 39, 65, 149, 195, 447, 745, 751, 1937, 2235, 2253, 3755, 5811, 9685, 9763, 11265, 29055, 29289, 48815, 111899, 146445, 335697, 559495, 1454687, 1678485, 4364061, 7273435, 21820305]

約数ペア:

[(1, 21820305), (3, 7273435), (5, 4364061), (13, 1678485), (15, 1454687), (39, 559495), (65, 335697), (149, 146445), (195, 111899), (447, 48815), (745, 29289), (751, 29055), (1937, 11265), (2235, 9763), (2253, 9685), (3755, 5811)]