19993520

素因数分解:

$2^4\times 5^1\times {\mathrm{491}}^1\times {\mathrm{509}}^1$

素因数の和:1013

約数の個数: 40

約数和(自身を含む): 46671120

約数和(自身を除く): 26677600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 491, 509, 982, 1018, 1964, 2036, 2455, 2545, 3928, 4072, 4910, 5090, 7856, 8144, 9820, 10180, 19640, 20360, 39280, 40720, 249919, 499838, 999676, 1249595, 1999352, 2499190, 3998704, 4998380, 9996760, 19993520]

約数ペア:

[(1, 19993520), (2, 9996760), (4, 4998380), (5, 3998704), (8, 2499190), (10, 1999352), (16, 1249595), (20, 999676), (40, 499838), (80, 249919), (491, 40720), (509, 39280), (982, 20360), (1018, 19640), (1964, 10180), (2036, 9820), (2455, 8144), (2545, 7856), (3928, 5090), (4072, 4910)]