20540780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{397}}^1$

素因数の和:618

約数の個数: 48

約数和(自身を含む): 46804800

約数和(自身を除く): 26264020

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 199, 260, 397, 398, 794, 796, 995, 1588, 1985, 1990, 2587, 3970, 3980, 5161, 5174, 7940, 10322, 10348, 12935, 20644, 25805, 25870, 51610, 51740, 79003, 103220, 158006, 316012, 395015, 790030, 1027039, 1580060, 2054078, 4108156, 5135195, 10270390, 20540780]

約数ペア:

[(1, 20540780), (2, 10270390), (4, 5135195), (5, 4108156), (10, 2054078), (13, 1580060), (20, 1027039), (26, 790030), (52, 395015), (65, 316012), (130, 158006), (199, 103220), (260, 79003), (397, 51740), (398, 51610), (794, 25870), (796, 25805), (995, 20644), (1588, 12935), (1985, 10348), (1990, 10322), (2587, 7940), (3970, 5174), (3980, 5161)]