21279640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{131}}^2$

素因数の和:304

約数の個数: 48

約数和(自身を含む): 49803840

約数和(自身を除く): 28524200

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 131, 155, 248, 262, 310, 524, 620, 655, 1048, 1240, 1310, 2620, 4061, 5240, 8122, 16244, 17161, 20305, 32488, 34322, 40610, 68644, 81220, 85805, 137288, 162440, 171610, 343220, 531991, 686440, 1063982, 2127964, 2659955, 4255928, 5319910, 10639820, 21279640]

約数ペア:

[(1, 21279640), (2, 10639820), (4, 5319910), (5, 4255928), (8, 2659955), (10, 2127964), (20, 1063982), (31, 686440), (40, 531991), (62, 343220), (124, 171610), (131, 162440), (155, 137288), (248, 85805), (262, 81220), (310, 68644), (524, 40610), (620, 34322), (655, 32488), (1048, 20305), (1240, 17161), (1310, 16244), (2620, 8122), (4061, 5240)]