21811105

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{229}}^1\times {\mathrm{443}}^1$

素因数の和:720

約数の個数: 16

約数和(自身を含む): 26959680

約数和(自身を除く): 5148575

約数列:

[1, 5, 43, 215, 229, 443, 1145, 2215, 9847, 19049, 49235, 95245, 101447, 507235, 4362221, 21811105]

約数ペア:

[(1, 21811105), (5, 4362221), (43, 507235), (215, 101447), (229, 95245), (443, 49235), (1145, 19049), (2215, 9847)]