20778212

素因数分解:

$2^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{4391}}^1$

素因数の和:4428

約数の個数: 36

約数和(自身を含む): 45009216

約数和(自身を除く): 24231004

約数列:

[1, 2, 4, 7, 13, 14, 26, 28, 52, 91, 169, 182, 338, 364, 676, 1183, 2366, 4391, 4732, 8782, 17564, 30737, 57083, 61474, 114166, 122948, 228332, 399581, 742079, 799162, 1484158, 1598324, 2968316, 5194553, 10389106, 20778212]

約数ペア:

[(1, 20778212), (2, 10389106), (4, 5194553), (7, 2968316), (13, 1598324), (14, 1484158), (26, 799162), (28, 742079), (52, 399581), (91, 228332), (169, 122948), (182, 114166), (338, 61474), (364, 57083), (676, 30737), (1183, 17564), (2366, 8782), (4391, 4732)]