21056840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{479}}^1$

素因数の和:654

約数の個数: 64

約数和(自身を含む): 54604800

約数和(自身を除く): 33547960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 157, 280, 314, 479, 628, 785, 958, 1099, 1256, 1570, 1916, 2198, 2395, 3140, 3353, 3832, 4396, 4790, 5495, 6280, 6706, 8792, 9580, 10990, 13412, 16765, 19160, 21980, 26824, 33530, 43960, 67060, 75203, 134120, 150406, 300812, 376015, 526421, 601624, 752030, 1052842, 1504060, 2105684, 2632105, 3008120, 4211368, 5264210, 10528420, 21056840]

約数ペア:

[(1, 21056840), (2, 10528420), (4, 5264210), (5, 4211368), (7, 3008120), (8, 2632105), (10, 2105684), (14, 1504060), (20, 1052842), (28, 752030), (35, 601624), (40, 526421), (56, 376015), (70, 300812), (140, 150406), (157, 134120), (280, 75203), (314, 67060), (479, 43960), (628, 33530), (785, 26824), (958, 21980), (1099, 19160), (1256, 16765), (1570, 13412), (1916, 10990), (2198, 9580), (2395, 8792), (3140, 6706), (3353, 6280), (3832, 5495), (4396, 4790)]