21373780

素因数分解:

$2^2\times 5^1\times {\mathrm{809}}^1\times {\mathrm{1321}}^1$

素因数の和:2139

約数の個数: 24

約数和(自身を含む): 44974440

約数和(自身を除く): 23600660

約数列:

[1, 2, 4, 5, 10, 20, 809, 1321, 1618, 2642, 3236, 4045, 5284, 6605, 8090, 13210, 16180, 26420, 1068689, 2137378, 4274756, 5343445, 10686890, 21373780]

約数ペア:

[(1, 21373780), (2, 10686890), (4, 5343445), (5, 4274756), (10, 2137378), (20, 1068689), (809, 26420), (1321, 16180), (1618, 13210), (2642, 8090), (3236, 6605), (4045, 5284)]