1978778890

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17988899}}^1$

素因数の和:17988917

約数の個数: 16

約数和(自身を含む): 3885602400

約数和(自身を除く): 1906823510

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 17988899, 35977798, 89944495, 179888990, 197877889, 395755778, 989389445, 1978778890]

約数ペア:

[(1, 1978778890), (2, 989389445), (5, 395755778), (10, 197877889), (11, 179888990), (22, 89944495), (55, 35977798), (110, 17988899)]