20487220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78797}}^1$

素因数の和:78819

約数の個数: 24

約数和(自身を含む): 46333224

約数和(自身を除く): 25846004

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 78797, 157594, 315188, 393985, 787970, 1024361, 1575940, 2048722, 4097444, 5121805, 10243610, 20487220]

約数ペア:

[(1, 20487220), (2, 10243610), (4, 5121805), (5, 4097444), (10, 2048722), (13, 1575940), (20, 1024361), (26, 787970), (52, 393985), (65, 315188), (130, 157594), (260, 78797)]