20091305

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{89}}^1\times {\mathrm{151}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 27578880

約数和(自身を除く): 7487575

約数列:

[1, 5, 13, 23, 65, 89, 115, 151, 299, 445, 755, 1157, 1495, 1963, 2047, 3473, 5785, 9815, 10235, 13439, 17365, 26611, 45149, 67195, 133055, 174707, 225745, 309097, 873535, 1545485, 4018261, 20091305]

約数ペア:

[(1, 20091305), (5, 4018261), (13, 1545485), (23, 873535), (65, 309097), (89, 225745), (115, 174707), (151, 133055), (299, 67195), (445, 45149), (755, 26611), (1157, 17365), (1495, 13439), (1963, 10235), (2047, 9815), (3473, 5785)]