21518840

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10979}}^1$

素因数の和:11004

約数の個数: 48

約数和(自身を含む): 56327400

約数和(自身を除く): 34808560

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10979, 21958, 43916, 54895, 76853, 87832, 109790, 153706, 219580, 307412, 384265, 439160, 537971, 614824, 768530, 1075942, 1537060, 2151884, 2689855, 3074120, 4303768, 5379710, 10759420, 21518840]

約数ペア:

[(1, 21518840), (2, 10759420), (4, 5379710), (5, 4303768), (7, 3074120), (8, 2689855), (10, 2151884), (14, 1537060), (20, 1075942), (28, 768530), (35, 614824), (40, 537971), (49, 439160), (56, 384265), (70, 307412), (98, 219580), (140, 153706), (196, 109790), (245, 87832), (280, 76853), (392, 54895), (490, 43916), (980, 21958), (1960, 10979)]