21377680

素因数分解:

$2^4\times 5^1\times {\mathrm{353}}^1\times {\mathrm{757}}^1$

素因数の和:1123

約数の個数: 40

約数和(自身を含む): 49909752

約数和(自身を除く): 28532072

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 353, 706, 757, 1412, 1514, 1765, 2824, 3028, 3530, 3785, 5648, 6056, 7060, 7570, 12112, 14120, 15140, 28240, 30280, 60560, 267221, 534442, 1068884, 1336105, 2137768, 2672210, 4275536, 5344420, 10688840, 21377680]

約数ペア:

[(1, 21377680), (2, 10688840), (4, 5344420), (5, 4275536), (8, 2672210), (10, 2137768), (16, 1336105), (20, 1068884), (40, 534442), (80, 267221), (353, 60560), (706, 30280), (757, 28240), (1412, 15140), (1514, 14120), (1765, 12112), (2824, 7570), (3028, 7060), (3530, 6056), (3785, 5648)]