19402000

素因数分解:

$2^4\times 5^3\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:221

約数の個数: 80

約数和(自身を含む): 47876400

約数和(自身を除く): 28474400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 89, 100, 109, 125, 178, 200, 218, 250, 356, 400, 436, 445, 500, 545, 712, 872, 890, 1000, 1090, 1424, 1744, 1780, 2000, 2180, 2225, 2725, 3560, 4360, 4450, 5450, 7120, 8720, 8900, 9701, 10900, 11125, 13625, 17800, 19402, 21800, 22250, 27250, 35600, 38804, 43600, 44500, 48505, 54500, 77608, 89000, 97010, 109000, 155216, 178000, 194020, 218000, 242525, 388040, 485050, 776080, 970100, 1212625, 1940200, 2425250, 3880400, 4850500, 9701000, 19402000]

約数ペア:

[(1, 19402000), (2, 9701000), (4, 4850500), (5, 3880400), (8, 2425250), (10, 1940200), (16, 1212625), (20, 970100), (25, 776080), (40, 485050), (50, 388040), (80, 242525), (89, 218000), (100, 194020), (109, 178000), (125, 155216), (178, 109000), (200, 97010), (218, 89000), (250, 77608), (356, 54500), (400, 48505), (436, 44500), (445, 43600), (500, 38804), (545, 35600), (712, 27250), (872, 22250), (890, 21800), (1000, 19402), (1090, 17800), (1424, 13625), (1744, 11125), (1780, 10900), (2000, 9701), (2180, 8900), (2225, 8720), (2725, 7120), (3560, 5450), (4360, 4450)]