800020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{181}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 1926288

約数和(自身を除く): 1126268

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 181, 221, 260, 340, 362, 442, 724, 884, 905, 1105, 1810, 2210, 2353, 3077, 3620, 4420, 4706, 6154, 9412, 11765, 12308, 15385, 23530, 30770, 40001, 47060, 61540, 80002, 160004, 200005, 400010, 800020]

約数ペア:

[(1, 800020), (2, 400010), (4, 200005), (5, 160004), (10, 80002), (13, 61540), (17, 47060), (20, 40001), (26, 30770), (34, 23530), (52, 15385), (65, 12308), (68, 11765), (85, 9412), (130, 6154), (170, 4706), (181, 4420), (221, 3620), (260, 3077), (340, 2353), (362, 2210), (442, 1810), (724, 1105), (884, 905)]