21120268

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{157}}^1\times {\mathrm{199}}^1$

素因数の和:386

約数の個数: 36

約数和(自身を含む): 40479600

約数和(自身を除く): 19359332

約数列:

[1, 2, 4, 13, 26, 52, 157, 169, 199, 314, 338, 398, 628, 676, 796, 2041, 2587, 4082, 5174, 8164, 10348, 26533, 31243, 33631, 53066, 62486, 67262, 106132, 124972, 134524, 406159, 812318, 1624636, 5280067, 10560134, 21120268]

約数ペア:

[(1, 21120268), (2, 10560134), (4, 5280067), (13, 1624636), (26, 812318), (52, 406159), (157, 134524), (169, 124972), (199, 106132), (314, 67262), (338, 62486), (398, 53066), (628, 33631), (676, 31243), (796, 26533), (2041, 10348), (2587, 8164), (4082, 5174)]