20965.000000

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{457}}^1$

素因数の和:479

約数の個数: 72

約数和(自身を含む): 2000544

約数和(自身を除く): 1424724

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 457, 630, 914, 1260, 1371, 1828, 2285, 2742, 3199, 4113, 4570, 5484, 6398, 6855, 8226, 9140, 9597, 12796, 13710, 15995, 16452, 19194, 20565, 27420, 28791, 31990, 38388, 41130, 47985, 57582, 63980, 82260, 95970, 115164, 143955, 191940, 287910, 575820]

約数ペア:

[(1, 575820), (2, 287910), (3, 191940), (4, 143955), (5, 115164), (6, 95970), (7, 82260), (9, 63980), (10, 57582), (12, 47985), (14, 41130), (15, 38388), (18, 31990), (20, 28791), (21, 27420), (28, 20565), (30, 19194), (35, 16452), (36, 15995), (42, 13710), (45, 12796), (60, 9597), (63, 9140), (70, 8226), (84, 6855), (90, 6398), (105, 5484), (126, 4570), (140, 4113), (180, 3199), (210, 2742), (252, 2285), (315, 1828), (420, 1371), (457, 1260), (630, 914)]