128680240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{123731}}^1$

素因数の和:123757

約数の個数: 40

約数和(自身を含む): 322198128

約数和(自身を除く): 193517888

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 123731, 247462, 494924, 618655, 989848, 1237310, 1608503, 1979696, 2474620, 3217006, 4949240, 6434012, 8042515, 9898480, 12868024, 16085030, 25736048, 32170060, 64340120, 128680240]

約数ペア:

[(1, 128680240), (2, 64340120), (4, 32170060), (5, 25736048), (8, 16085030), (10, 12868024), (13, 9898480), (16, 8042515), (20, 6434012), (26, 4949240), (40, 3217006), (52, 2474620), (65, 1979696), (80, 1608503), (104, 1237310), (130, 989848), (208, 618655), (260, 494924), (520, 247462), (1040, 123731)]