21280460

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{17443}}^1$

素因数の和:17513

約数の個数: 24

約数和(自身を含む): 45424176

約数和(自身を除く): 24143716

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 17443, 34886, 69772, 87215, 174430, 348860, 1064023, 2128046, 4256092, 5320115, 10640230, 21280460]

約数ペア:

[(1, 21280460), (2, 10640230), (4, 5320115), (5, 4256092), (10, 2128046), (20, 1064023), (61, 348860), (122, 174430), (244, 87215), (305, 69772), (610, 34886), (1220, 17443)]