21400720

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{293}}^1$

素因数の和:400

約数の個数: 80

約数和(自身を含む): 55121472

約数和(自身を除く): 33720752

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 83, 88, 110, 166, 176, 220, 293, 332, 415, 440, 586, 664, 830, 880, 913, 1172, 1328, 1465, 1660, 1826, 2344, 2930, 3223, 3320, 3652, 4565, 4688, 5860, 6446, 6640, 7304, 9130, 11720, 12892, 14608, 16115, 18260, 23440, 24319, 25784, 32230, 36520, 48638, 51568, 64460, 73040, 97276, 121595, 128920, 194552, 243190, 257840, 267509, 389104, 486380, 535018, 972760, 1070036, 1337545, 1945520, 2140072, 2675090, 4280144, 5350180, 10700360, 21400720]

約数ペア:

[(1, 21400720), (2, 10700360), (4, 5350180), (5, 4280144), (8, 2675090), (10, 2140072), (11, 1945520), (16, 1337545), (20, 1070036), (22, 972760), (40, 535018), (44, 486380), (55, 389104), (80, 267509), (83, 257840), (88, 243190), (110, 194552), (166, 128920), (176, 121595), (220, 97276), (293, 73040), (332, 64460), (415, 51568), (440, 48638), (586, 36520), (664, 32230), (830, 25784), (880, 24319), (913, 23440), (1172, 18260), (1328, 16115), (1465, 14608), (1660, 12892), (1826, 11720), (2344, 9130), (2930, 7304), (3223, 6640), (3320, 6446), (3652, 5860), (4565, 4688)]