20388775

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{151}}^1\times {\mathrm{491}}^1$

素因数の和:663

約数の個数: 24

約数和(自身を含む): 27819648

約数和(自身を除く): 7430873

約数列:

[1, 5, 11, 25, 55, 151, 275, 491, 755, 1661, 2455, 3775, 5401, 8305, 12275, 27005, 41525, 74141, 135025, 370705, 815551, 1853525, 4077755, 20388775]

約数ペア:

[(1, 20388775), (5, 4077755), (11, 1853525), (25, 815551), (55, 370705), (151, 135025), (275, 74141), (491, 41525), (755, 27005), (1661, 12275), (2455, 8305), (3775, 5401)]