128839720

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{103903}}^1$

素因数の和:103945

約数の個数: 32

約数和(自身を含む): 299243520

約数和(自身を除く): 170403800

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 103903, 207806, 415612, 519515, 831224, 1039030, 2078060, 3220993, 4156120, 6441986, 12883972, 16104965, 25767944, 32209930, 64419860, 128839720]

約数ペア:

[(1, 128839720), (2, 64419860), (4, 32209930), (5, 25767944), (8, 16104965), (10, 12883972), (20, 6441986), (31, 4156120), (40, 3220993), (62, 2078060), (124, 1039030), (155, 831224), (248, 519515), (310, 415612), (620, 207806), (1240, 103903)]