21297320

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{499}}^1$

素因数の和:618

約数の個数: 64

約数和(自身を含む): 52920000

約数和(自身を除く): 31622680

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 97, 110, 194, 220, 388, 440, 485, 499, 776, 970, 998, 1067, 1940, 1996, 2134, 2495, 3880, 3992, 4268, 4990, 5335, 5489, 8536, 9980, 10670, 10978, 19960, 21340, 21956, 27445, 42680, 43912, 48403, 54890, 96806, 109780, 193612, 219560, 242015, 387224, 484030, 532433, 968060, 1064866, 1936120, 2129732, 2662165, 4259464, 5324330, 10648660, 21297320]

約数ペア:

[(1, 21297320), (2, 10648660), (4, 5324330), (5, 4259464), (8, 2662165), (10, 2129732), (11, 1936120), (20, 1064866), (22, 968060), (40, 532433), (44, 484030), (55, 387224), (88, 242015), (97, 219560), (110, 193612), (194, 109780), (220, 96806), (388, 54890), (440, 48403), (485, 43912), (499, 42680), (776, 27445), (970, 21956), (998, 21340), (1067, 19960), (1940, 10978), (1996, 10670), (2134, 9980), (2495, 8536), (3880, 5489), (3992, 5335), (4268, 4990)]