21607420

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{199}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 46872000

約数和(自身を除く): 25264580

約数列:

[1, 2, 4, 5, 10, 20, 61, 89, 122, 178, 199, 244, 305, 356, 398, 445, 610, 796, 890, 995, 1220, 1780, 1990, 3980, 5429, 10858, 12139, 17711, 21716, 24278, 27145, 35422, 48556, 54290, 60695, 70844, 88555, 108580, 121390, 177110, 242780, 354220, 1080371, 2160742, 4321484, 5401855, 10803710, 21607420]

約数ペア:

[(1, 21607420), (2, 10803710), (4, 5401855), (5, 4321484), (10, 2160742), (20, 1080371), (61, 354220), (89, 242780), (122, 177110), (178, 121390), (199, 108580), (244, 88555), (305, 70844), (356, 60695), (398, 54290), (445, 48556), (610, 35422), (796, 27145), (890, 24278), (995, 21716), (1220, 17711), (1780, 12139), (1990, 10858), (3980, 5429)]