21428320

素因数分解:

$2^5\times 5^1\times {\mathrm{199}}^1\times {\mathrm{673}}^1$

素因数の和:887

約数の個数: 48

約数和(自身を含む): 50954400

約数和(自身を除く): 29526080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 199, 398, 673, 796, 995, 1346, 1592, 1990, 2692, 3184, 3365, 3980, 5384, 6368, 6730, 7960, 10768, 13460, 15920, 21536, 26920, 31840, 53840, 107680, 133927, 267854, 535708, 669635, 1071416, 1339270, 2142832, 2678540, 4285664, 5357080, 10714160, 21428320]

約数ペア:

[(1, 21428320), (2, 10714160), (4, 5357080), (5, 4285664), (8, 2678540), (10, 2142832), (16, 1339270), (20, 1071416), (32, 669635), (40, 535708), (80, 267854), (160, 133927), (199, 107680), (398, 53840), (673, 31840), (796, 26920), (995, 21536), (1346, 15920), (1592, 13460), (1990, 10768), (2692, 7960), (3184, 6730), (3365, 6368), (3980, 5384)]