21657779

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{151}}^1$

素因数の和:251

約数の個数: 32

約数和(自身を含む): 27578880

約数和(自身を除く): 5921101

約数列:

[1, 11, 13, 17, 59, 143, 151, 187, 221, 649, 767, 1003, 1661, 1963, 2431, 2567, 8437, 8909, 11033, 13039, 21593, 28237, 33371, 97999, 115817, 143429, 151453, 367081, 1273987, 1665983, 1968889, 21657779]

約数ペア:

[(1, 21657779), (11, 1968889), (13, 1665983), (17, 1273987), (59, 367081), (143, 151453), (151, 143429), (187, 115817), (221, 97999), (649, 33371), (767, 28237), (1003, 21593), (1661, 13039), (1963, 11033), (2431, 8909), (2567, 8437)]