21870730

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{397}}^1\times {\mathrm{787}}^1$

素因数の和:1198

約数の個数: 32

約数和(自身を含む): 45161856

約数和(自身を除く): 23291126

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 397, 787, 794, 1574, 1985, 2779, 3935, 3970, 5509, 5558, 7870, 11018, 13895, 27545, 27790, 55090, 312439, 624878, 1562195, 2187073, 3124390, 4374146, 10935365, 21870730]

約数ペア:

[(1, 21870730), (2, 10935365), (5, 4374146), (7, 3124390), (10, 2187073), (14, 1562195), (35, 624878), (70, 312439), (397, 55090), (787, 27790), (794, 27545), (1574, 13895), (1985, 11018), (2779, 7870), (3935, 5558), (3970, 5509)]