21293428

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{107}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 41912640

約数和(自身を除く): 20619212

約数列:

[1, 2, 4, 13, 26, 43, 52, 86, 89, 107, 172, 178, 214, 356, 428, 559, 1118, 1157, 1391, 2236, 2314, 2782, 3827, 4601, 4628, 5564, 7654, 9202, 9523, 15308, 18404, 19046, 38092, 49751, 59813, 99502, 119626, 123799, 199004, 239252, 247598, 409489, 495196, 818978, 1637956, 5323357, 10646714, 21293428]

約数ペア:

[(1, 21293428), (2, 10646714), (4, 5323357), (13, 1637956), (26, 818978), (43, 495196), (52, 409489), (86, 247598), (89, 239252), (107, 199004), (172, 123799), (178, 119626), (214, 99502), (356, 59813), (428, 49751), (559, 38092), (1118, 19046), (1157, 18404), (1391, 15308), (2236, 9523), (2314, 9202), (2782, 7654), (3827, 5564), (4601, 4628)]