21178020

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{409}}^1\times {\mathrm{863}}^1$

素因数の和:1284

約数の個数: 48

約数和(自身を含む): 59512320

約数和(自身を除く): 38334300

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 409, 818, 863, 1227, 1636, 1726, 2045, 2454, 2589, 3452, 4090, 4315, 4908, 5178, 6135, 8180, 8630, 10356, 12270, 12945, 17260, 24540, 25890, 51780, 352967, 705934, 1058901, 1411868, 1764835, 2117802, 3529670, 4235604, 5294505, 7059340, 10589010, 21178020]

約数ペア:

[(1, 21178020), (2, 10589010), (3, 7059340), (4, 5294505), (5, 4235604), (6, 3529670), (10, 2117802), (12, 1764835), (15, 1411868), (20, 1058901), (30, 705934), (60, 352967), (409, 51780), (818, 25890), (863, 24540), (1227, 17260), (1636, 12945), (1726, 12270), (2045, 10356), (2454, 8630), (2589, 8180), (3452, 6135), (4090, 5178), (4315, 4908)]