20978925

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{431}}^1$

素因数の和:514

約数の個数: 48

約数和(自身を含む): 38568960

約数和(自身を除く): 17590035

約数列:

[1, 3, 5, 11, 15, 25, 33, 55, 59, 75, 165, 177, 275, 295, 431, 649, 825, 885, 1293, 1475, 1947, 2155, 3245, 4425, 4741, 6465, 9735, 10775, 14223, 16225, 23705, 25429, 32325, 48675, 71115, 76287, 118525, 127145, 279719, 355575, 381435, 635725, 839157, 1398595, 1907175, 4195785, 6992975, 20978925]

約数ペア:

[(1, 20978925), (3, 6992975), (5, 4195785), (11, 1907175), (15, 1398595), (25, 839157), (33, 635725), (55, 381435), (59, 355575), (75, 279719), (165, 127145), (177, 118525), (275, 76287), (295, 71115), (431, 48675), (649, 32325), (825, 25429), (885, 23705), (1293, 16225), (1475, 14223), (1947, 10775), (2155, 9735), (3245, 6465), (4425, 4741)]