21291465

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{227}}^1$

素因数の和:298

約数の個数: 48

約数和(自身を含む): 38052288

約数和(自身を除く): 16760823

約数列:

[1, 3, 5, 13, 15, 37, 39, 65, 111, 169, 185, 195, 227, 481, 507, 555, 681, 845, 1135, 1443, 2405, 2535, 2951, 3405, 6253, 7215, 8399, 8853, 14755, 18759, 25197, 31265, 38363, 41995, 44265, 93795, 109187, 115089, 125985, 191815, 327561, 545935, 575445, 1419431, 1637805, 4258293, 7097155, 21291465]

約数ペア:

[(1, 21291465), (3, 7097155), (5, 4258293), (13, 1637805), (15, 1419431), (37, 575445), (39, 545935), (65, 327561), (111, 191815), (169, 125985), (185, 115089), (195, 109187), (227, 93795), (481, 44265), (507, 41995), (555, 38363), (681, 31265), (845, 25197), (1135, 18759), (1443, 14755), (2405, 8853), (2535, 8399), (2951, 7215), (3405, 6253)]