21072920

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1019}}^1$

素因数の和:1088

約数の個数: 64

約数和(自身を含む): 52876800

約数和(自身を除く): 31803880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 47, 55, 88, 94, 110, 188, 220, 235, 376, 440, 470, 517, 940, 1019, 1034, 1880, 2038, 2068, 2585, 4076, 4136, 5095, 5170, 8152, 10190, 10340, 11209, 20380, 20680, 22418, 40760, 44836, 47893, 56045, 89672, 95786, 112090, 191572, 224180, 239465, 383144, 448360, 478930, 526823, 957860, 1053646, 1915720, 2107292, 2634115, 4214584, 5268230, 10536460, 21072920]

約数ペア:

[(1, 21072920), (2, 10536460), (4, 5268230), (5, 4214584), (8, 2634115), (10, 2107292), (11, 1915720), (20, 1053646), (22, 957860), (40, 526823), (44, 478930), (47, 448360), (55, 383144), (88, 239465), (94, 224180), (110, 191572), (188, 112090), (220, 95786), (235, 89672), (376, 56045), (440, 47893), (470, 44836), (517, 40760), (940, 22418), (1019, 20680), (1034, 20380), (1880, 11209), (2038, 10340), (2068, 10190), (2585, 8152), (4076, 5170), (4136, 5095)]