20998509

素因数分解:

$3^1\times 7^2\times {\mathrm{211}}^1\times {\mathrm{677}}^1$

素因数の和:905

約数の個数: 24

約数和(自身を含む): 32771808

約数和(自身を除く): 11773299

約数列:

[1, 3, 7, 21, 49, 147, 211, 633, 677, 1477, 2031, 4431, 4739, 10339, 14217, 31017, 33173, 99519, 142847, 428541, 999929, 2999787, 6999503, 20998509]

約数ペア:

[(1, 20998509), (3, 6999503), (7, 2999787), (21, 999929), (49, 428541), (147, 142847), (211, 99519), (633, 33173), (677, 31017), (1477, 14217), (2031, 10339), (4431, 4739)]