20905040

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20101}}^1$

素因数の和:20127

約数の個数: 40

約数和(自身を含む): 52345608

約数和(自身を除く): 31440568

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20101, 40202, 80404, 100505, 160808, 201010, 261313, 321616, 402020, 522626, 804040, 1045252, 1306565, 1608080, 2090504, 2613130, 4181008, 5226260, 10452520, 20905040]

約数ペア:

[(1, 20905040), (2, 10452520), (4, 5226260), (5, 4181008), (8, 2613130), (10, 2090504), (13, 1608080), (16, 1306565), (20, 1045252), (26, 804040), (40, 522626), (52, 402020), (65, 321616), (80, 261313), (104, 201010), (130, 160808), (208, 100505), (260, 80404), (520, 40202), (1040, 20101)]