20887980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{37}}^1\times {\mathrm{97}}^2$

素因数の和:243

約数の個数: 72

約数和(自身を含む): 60692688

約数和(自身を除く): 39804708

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 37, 60, 74, 97, 111, 148, 185, 194, 222, 291, 370, 388, 444, 485, 555, 582, 740, 970, 1110, 1164, 1455, 1940, 2220, 2910, 3589, 5820, 7178, 9409, 10767, 14356, 17945, 18818, 21534, 28227, 35890, 37636, 43068, 47045, 53835, 56454, 71780, 94090, 107670, 112908, 141135, 188180, 215340, 282270, 348133, 564540, 696266, 1044399, 1392532, 1740665, 2088798, 3481330, 4177596, 5221995, 6962660, 10443990, 20887980]

約数ペア:

[(1, 20887980), (2, 10443990), (3, 6962660), (4, 5221995), (5, 4177596), (6, 3481330), (10, 2088798), (12, 1740665), (15, 1392532), (20, 1044399), (30, 696266), (37, 564540), (60, 348133), (74, 282270), (97, 215340), (111, 188180), (148, 141135), (185, 112908), (194, 107670), (222, 94090), (291, 71780), (370, 56454), (388, 53835), (444, 47045), (485, 43068), (555, 37636), (582, 35890), (740, 28227), (970, 21534), (1110, 18818), (1164, 17945), (1455, 14356), (1940, 10767), (2220, 9409), (2910, 7178), (3589, 5820)]