21640880

素因数分解:

$2^4\times 5^1\times {\mathrm{157}}^1\times {\mathrm{1723}}^1$

素因数の和:1893

約数の個数: 40

約数和(自身を含む): 50664912

約数和(自身を除く): 29024032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 157, 314, 628, 785, 1256, 1570, 1723, 2512, 3140, 3446, 6280, 6892, 8615, 12560, 13784, 17230, 27568, 34460, 68920, 137840, 270511, 541022, 1082044, 1352555, 2164088, 2705110, 4328176, 5410220, 10820440, 21640880]

約数ペア:

[(1, 21640880), (2, 10820440), (4, 5410220), (5, 4328176), (8, 2705110), (10, 2164088), (16, 1352555), (20, 1082044), (40, 541022), (80, 270511), (157, 137840), (314, 68920), (628, 34460), (785, 27568), (1256, 17230), (1570, 13784), (1723, 12560), (2512, 8615), (3140, 6892), (3446, 6280)]