20621425

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{401}}^1$

素因数の和:450

約数の個数: 36

約数和(自身を含む): 29834028

約数和(自身を除く): 9212603

約数列:

[1, 5, 11, 17, 25, 55, 85, 121, 187, 275, 401, 425, 605, 935, 2005, 2057, 3025, 4411, 4675, 6817, 10025, 10285, 22055, 34085, 48521, 51425, 74987, 110275, 170425, 242605, 374935, 824857, 1213025, 1874675, 4124285, 20621425]

約数ペア:

[(1, 20621425), (5, 4124285), (11, 1874675), (17, 1213025), (25, 824857), (55, 374935), (85, 242605), (121, 170425), (187, 110275), (275, 74987), (401, 51425), (425, 48521), (605, 34085), (935, 22055), (2005, 10285), (2057, 10025), (3025, 6817), (4411, 4675)]