20787440

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1319}}^1$

素因数の和:1529

約数の個数: 40

約数和(自身を含む): 48612960

約数和(自身を除く): 27825520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1319, 1576, 1970, 2638, 3152, 3940, 5276, 6595, 7880, 10552, 13190, 15760, 21104, 26380, 52760, 105520, 259843, 519686, 1039372, 1299215, 2078744, 2598430, 4157488, 5196860, 10393720, 20787440]

約数ペア:

[(1, 20787440), (2, 10393720), (4, 5196860), (5, 4157488), (8, 2598430), (10, 2078744), (16, 1299215), (20, 1039372), (40, 519686), (80, 259843), (197, 105520), (394, 52760), (788, 26380), (985, 21104), (1319, 15760), (1576, 13190), (1970, 10552), (2638, 7880), (3152, 6595), (3940, 5276)]