256775740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{987599}}^1$

素因数の和:987621

約数の個数: 24

約数和(自身を含む): 580708800

約数和(自身を除く): 323933060

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 987599, 1975198, 3950396, 4937995, 9875990, 12838787, 19751980, 25677574, 51355148, 64193935, 128387870, 256775740]

約数ペア:

[(1, 256775740), (2, 128387870), (4, 64193935), (5, 51355148), (10, 25677574), (13, 19751980), (20, 12838787), (26, 9875990), (52, 4937995), (65, 3950396), (130, 1975198), (260, 987599)]