21304880

素因数分解:

$2^4\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1061}}^1$

素因数の和:1325

約数の個数: 40

約数和(自身を含む): 49778064

約数和(自身を除く): 28473184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 251, 502, 1004, 1061, 1255, 2008, 2122, 2510, 4016, 4244, 5020, 5305, 8488, 10040, 10610, 16976, 20080, 21220, 42440, 84880, 266311, 532622, 1065244, 1331555, 2130488, 2663110, 4260976, 5326220, 10652440, 21304880]

約数ペア:

[(1, 21304880), (2, 10652440), (4, 5326220), (5, 4260976), (8, 2663110), (10, 2130488), (16, 1331555), (20, 1065244), (40, 532622), (80, 266311), (251, 84880), (502, 42440), (1004, 21220), (1061, 20080), (1255, 16976), (2008, 10610), (2122, 10040), (2510, 8488), (4016, 5305), (4244, 5020)]