21123998

素因数分解:

$2^1\times 7^4\times {\mathrm{53}}^1\times {\mathrm{83}}^1$

素因数の和:166

約数の個数: 40

約数和(自身を含む): 38116008

約数和(自身を除く): 16992010

約数列:

[1, 2, 7, 14, 49, 53, 83, 98, 106, 166, 343, 371, 581, 686, 742, 1162, 2401, 2597, 4067, 4399, 4802, 5194, 8134, 8798, 18179, 28469, 30793, 36358, 56938, 61586, 127253, 199283, 215551, 254506, 398566, 431102, 1508857, 3017714, 10561999, 21123998]

約数ペア:

[(1, 21123998), (2, 10561999), (7, 3017714), (14, 1508857), (49, 431102), (53, 398566), (83, 254506), (98, 215551), (106, 199283), (166, 127253), (343, 61586), (371, 56938), (581, 36358), (686, 30793), (742, 28469), (1162, 18179), (2401, 8798), (2597, 8134), (4067, 5194), (4399, 4802)]