18205720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{223}}^1$

素因数の和:404

約数の個数: 64

約数和(自身を含む): 44593920

約数和(自身を除く): 26388200

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 157, 223, 260, 314, 446, 520, 628, 785, 892, 1115, 1256, 1570, 1784, 2041, 2230, 2899, 3140, 4082, 4460, 5798, 6280, 8164, 8920, 10205, 11596, 14495, 16328, 20410, 23192, 28990, 35011, 40820, 57980, 70022, 81640, 115960, 140044, 175055, 280088, 350110, 455143, 700220, 910286, 1400440, 1820572, 2275715, 3641144, 4551430, 9102860, 18205720]

約数ペア:

[(1, 18205720), (2, 9102860), (4, 4551430), (5, 3641144), (8, 2275715), (10, 1820572), (13, 1400440), (20, 910286), (26, 700220), (40, 455143), (52, 350110), (65, 280088), (104, 175055), (130, 140044), (157, 115960), (223, 81640), (260, 70022), (314, 57980), (446, 40820), (520, 35011), (628, 28990), (785, 23192), (892, 20410), (1115, 16328), (1256, 14495), (1570, 11596), (1784, 10205), (2041, 8920), (2230, 8164), (2899, 6280), (3140, 5798), (4082, 4460)]