21679955

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1$

素因数の和:251

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 7972525

約数列:

[1, 5, 11, 43, 55, 89, 103, 215, 445, 473, 515, 979, 1133, 2365, 3827, 4429, 4895, 5665, 9167, 19135, 22145, 42097, 45835, 48719, 100837, 210485, 243595, 394181, 504185, 1970905, 4335991, 21679955]

約数ペア:

[(1, 21679955), (5, 4335991), (11, 1970905), (43, 504185), (55, 394181), (89, 243595), (103, 210485), (215, 100837), (445, 48719), (473, 45835), (515, 42097), (979, 22145), (1133, 19135), (2365, 9167), (3827, 5665), (4429, 4895)]