21540540

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{51287}}^1$

素因数の和:51306

約数の個数: 48

約数和(自身を含む): 68931072

約数和(自身を除く): 47390532

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 51287, 102574, 153861, 205148, 256435, 307722, 359009, 512870, 615444, 718018, 769305, 1025740, 1077027, 1436036, 1538610, 1795045, 2154054, 3077220, 3590090, 4308108, 5385135, 7180180, 10770270, 21540540]

約数ペア:

[(1, 21540540), (2, 10770270), (3, 7180180), (4, 5385135), (5, 4308108), (6, 3590090), (7, 3077220), (10, 2154054), (12, 1795045), (14, 1538610), (15, 1436036), (20, 1077027), (21, 1025740), (28, 769305), (30, 718018), (35, 615444), (42, 512870), (60, 359009), (70, 307722), (84, 256435), (105, 205148), (140, 153861), (210, 102574), (420, 51287)]