21178264

素因数分解:

$2^3\times {\mathrm{109}}^1\times {\mathrm{149}}^1\times {\mathrm{163}}^1$

素因数の和:427

約数の個数: 32

約数和(自身を含む): 40590000

約数和(自身を除く): 19411736

約数列:

[1, 2, 4, 8, 109, 149, 163, 218, 298, 326, 436, 596, 652, 872, 1192, 1304, 16241, 17767, 24287, 32482, 35534, 48574, 64964, 71068, 97148, 129928, 142136, 194296, 2647283, 5294566, 10589132, 21178264]

約数ペア:

[(1, 21178264), (2, 10589132), (4, 5294566), (8, 2647283), (109, 194296), (149, 142136), (163, 129928), (218, 97148), (298, 71068), (326, 64964), (436, 48574), (596, 35534), (652, 32482), (872, 24287), (1192, 17767), (1304, 16241)]