21420045

素因数分解:

$3^4\times 5^1\times {\mathrm{52889}}^1$

素因数の和:52906

約数の個数: 20

約数和(自身を含む): 38398140

約数和(自身を除く): 16978095

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52889, 158667, 264445, 476001, 793335, 1428003, 2380005, 4284009, 7140015, 21420045]

約数ペア:

[(1, 21420045), (3, 7140015), (5, 4284009), (9, 2380005), (15, 1428003), (27, 793335), (45, 476001), (81, 264445), (135, 158667), (405, 52889)]