21390495

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1487}}^1$

素因数の和:1639

約数の個数: 32

約数和(自身を含む): 39426048

約数和(自身を除く): 18035553

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 137, 411, 685, 959, 1487, 2055, 2877, 4461, 4795, 7435, 10409, 14385, 22305, 31227, 52045, 156135, 203719, 611157, 1018595, 1426033, 3055785, 4278099, 7130165, 21390495]

約数ペア:

[(1, 21390495), (3, 7130165), (5, 4278099), (7, 3055785), (15, 1426033), (21, 1018595), (35, 611157), (105, 203719), (137, 156135), (411, 52045), (685, 31227), (959, 22305), (1487, 14385), (2055, 10409), (2877, 7435), (4461, 4795)]