18732740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{661}}^1$

素因数の和:792

約数の個数: 48

約数和(自身を含む): 42818160

約数和(自身を除く): 24085420

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 109, 130, 218, 260, 436, 545, 661, 1090, 1322, 1417, 2180, 2644, 2834, 3305, 5668, 6610, 7085, 8593, 13220, 14170, 17186, 28340, 34372, 42965, 72049, 85930, 144098, 171860, 288196, 360245, 720490, 936637, 1440980, 1873274, 3746548, 4683185, 9366370, 18732740]

約数ペア:

[(1, 18732740), (2, 9366370), (4, 4683185), (5, 3746548), (10, 1873274), (13, 1440980), (20, 936637), (26, 720490), (52, 360245), (65, 288196), (109, 171860), (130, 144098), (218, 85930), (260, 72049), (436, 42965), (545, 34372), (661, 28340), (1090, 17186), (1322, 14170), (1417, 13220), (2180, 8593), (2644, 7085), (2834, 6610), (3305, 5668)]