21420025

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{73}}^1\times {\mathrm{97}}^1$

素因数の和:202

約数の個数: 36

約数和(自身を含む): 29899996

約数和(自身を除く): 8479971

約数列:

[1, 5, 11, 25, 55, 73, 97, 121, 275, 365, 485, 605, 803, 1067, 1825, 2425, 3025, 4015, 5335, 7081, 8833, 11737, 20075, 26675, 35405, 44165, 58685, 77891, 177025, 220825, 293425, 389455, 856801, 1947275, 4284005, 21420025]

約数ペア:

[(1, 21420025), (5, 4284005), (11, 1947275), (25, 856801), (55, 389455), (73, 293425), (97, 220825), (121, 177025), (275, 77891), (365, 58685), (485, 44165), (605, 35405), (803, 26675), (1067, 20075), (1825, 11737), (2425, 8833), (3025, 7081), (4015, 5335)]