21640520

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{359}}^1$

素因数の和:518

約数の個数: 64

約数和(自身を含む): 53654400

約数和(自身を除く): 32013880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 137, 220, 274, 359, 440, 548, 685, 718, 1096, 1370, 1436, 1507, 1795, 2740, 2872, 3014, 3590, 3949, 5480, 6028, 7180, 7535, 7898, 12056, 14360, 15070, 15796, 19745, 30140, 31592, 39490, 49183, 60280, 78980, 98366, 157960, 196732, 245915, 393464, 491830, 541013, 983660, 1082026, 1967320, 2164052, 2705065, 4328104, 5410130, 10820260, 21640520]

約数ペア:

[(1, 21640520), (2, 10820260), (4, 5410130), (5, 4328104), (8, 2705065), (10, 2164052), (11, 1967320), (20, 1082026), (22, 983660), (40, 541013), (44, 491830), (55, 393464), (88, 245915), (110, 196732), (137, 157960), (220, 98366), (274, 78980), (359, 60280), (440, 49183), (548, 39490), (685, 31592), (718, 30140), (1096, 19745), (1370, 15796), (1436, 15070), (1507, 14360), (1795, 12056), (2740, 7898), (2872, 7535), (3014, 7180), (3590, 6028), (3949, 5480)]